The other thing we can strongly suppose is that Palpatine doesn't seem to look like the...'abstinent' one. Anyway, let's just say that he certainly liked to have some fun with some women. The problem was that someday he fell on the wrong woman and this was the little detail he didn't foresee.
One evening, as his teenage Apprentice was really getting on his nerves, he went in a bar of Coruscant with the idea of changing his mind. Grumbling in one corner of the bar with his glass in his hand, he saw a woman sat near him. He felt that she was looking at him with a weird look on her face and he slowly looked at her. She was, well, pretty (of course she was pretty, he's blond, she was a brunette, duh!), but she looked...poor. Why would he be interested in a poor looking woman? He could have any woman he wanted in the galaxy, but the way she was fixing him was annoying him. He finally asked her what was the problem, from what she replied that she was just wondering if they didn't know each other. No, they weren't knowing each other. If this was her flirting technique, it was really pitiful. He hoped she would go away, but she insisted to stay, ordering a drink too. She introduced herself as Shmi Skywalker, name that he would unfortunately never forget. They eventually started a conversation and eventually got very drunk, telling their personal problems to each other. As she was searching a place to sleep and as they pratically jumped in each other's arms, Palpatine invited her in his home, invitation she of course accepted. The next morning, Palpatine woke up with a horrible headache (and for a Force-sensitive, you know it must be worst), discovering the horrible fact that he had just slept with a slave, and especially, someone else's slave. He threw her out, hoping that he would never heard of her again.
Unfortunately, more than three years later, Palpatine had a little surprise. Shmi rang at his door and introduced him to a little blond boy with a dimple on the chin and a mischievous look in his blue eyes who was named Anakin. Very happy (ahem) to know about his paternity, Palpatine managed to get rid of that slave and of that child. For some reason, he didn't want to kill them. Perhaps they could be useful someday. So, he asked Khameir to visit her master and to buy her. Meanwhile, Palpatine somehow changed his mind about Shmi's fate, as she had just found the senator's weakness...
She was pretty, she was sexy and she wasn't too stubborn, so why wouldn't he want to marry her? In addition, she was helping him to get a more serious image and the fact that she once was a slave was proving to everyone that he was against slavery in that huge debate in the Senate. And also, Palpatine would have never married a highly virtuous and stuck-up lady. He's a Sith Lord, he didn't believe in marriage. To give up his liberty, Palpatine needed some VERY GOOD reasons that Shmi's previous condition seemed to give him...
Anyway, they got married and this is THE thing that changed all the rest of their lives.
When the fact that he had married a slave stopped helping him and before people use this against him for some political reason, he started to make everybody forget it. He clouded it in their minds and they weren't able to tell clearly if it was true or if it was only a rumor. His reputation now restored like before, but now known as a much more serious man, Palpatine continued his plans. Only a few were still hardly believing the rumors around the Palpatines, and among them was the newly elected Queen of Naboo.
After King Veruna, Naboo's previous ruler, had stepped down of his position, Padmé Naberrie, a fourteen years old young brat, took his place, taking the name of Queen Amidala. This, of course, wasn't really pleasing Palpatine. He first thought her young age could be an advantage. He thought she could be more easily influenced, but when he discovered the spoiled and stubborn brat she was, he secretly started to hate her. He saw her thinking she was the Queen of the Universe and giving orders to everybody, and especially to him. Palpatine wished he could just strangle her someday, hoping he would have the chance and the occasion to kill her.
Palpatine's moment of opportunity came some years later, after he had made some deal with the Trade Federation as Darth Sidious, the Dark Lord of the Sith. He arranged for the cowardly Neimoidians to brazenly blockade and invade the peaceful planet of Naboo in protest over increased taxation from the Senate. Sidious ordered the Neimodians to kill the Jedi ambassadors sent to negotiate a settlement. When they failed, he dispatched Darth Maul. Meanwhile, as Palpatine, he continued to play his role of the Senator of Naboo, greatly affected by what was happening on his planet. Queen Amidala escaped from Naboo and rushed to Coruscant for Palpatine's help and the two pleaded to the Senate for intervention, only to see their request stalemated by Trade Federation filibustering. Frustrated by the government's inability to do anything, Queen Amidala acted upon Palpatine's suggestion, tired to hear him insist to make her say it, and called for a Vote of No Confidence in the Republic's leadership.
Chancellor Valorum was voted out of office, and Palpatine was soon nominated to succeed him. Queen Amidala was now useless and decided to go back on Naboo. Palpatine tried to convince her to stay on Coruscant, but she was insisting so much that Palpatine 'sadly' decided to let her go and DIE! Hoping that she would be killed, Palpatine quietly waited to became Chancellor, as the crisis on Naboo had created a strong sympathy vote. Of course, like the clever politician he was, he promised to reunite the disaffected and bring order and justice to the government (ahem!).
Palpatine took advantage of his new position and followed up his plans. Passing himself off as Jedi Master Sifo-Dyas, Palpatine contacted the Kaminoans and asked them to make a huge clone army for the Republic. As Darth Maul had been killed, Palpatine recruited a new Sith Apprentice, an old retired Jedi Knight, Count Dooku, who pleaded allegiance to the Dark Side and became Darth Tyranus. Tyranus then found a bounty hunter named Jango Fett to be the model of the clones. Knowing that this would be very useful someday, Palpatine waited the time it needed to his clones to be ready for what would cause the end of the Republic.
The time needed passed and ten years later, Palpatine's other occasion came. Secretly suggesting in the Senate the fact that a clone army would be useful for the Republic, some senators took back the idea and really proposed it as a project. A debate ensued in which Padmé Amidala, now the senator of Naboo, became the leader of the opposition. This was the thing that HORRIBLY MADE ANGRY Palpatine because the Naboo Bitch was now GREATLY INTERFERING in his plans. He contacted Tyranus who contacted Jango Fett who contacted Zam Wesell (phew!) to finally make her be killed on the day she was supposed to vote against the formation of a clone army. If she was dead, nobody else would be there to oppose himself to Palpatine. Unfortunately, she didn't die. She used one of her decoy as usual. The vote was defered to another day. Palpatine was still hoping to see her die and he suggested to her to be protected by that Jedi who killed Darth Maul ten years before, Obi-Wan Kenobi. He could them kill them both. Unfortunately, someone else interfered in his previous plans. Anakin, his nineteen years old son, had in mind to be in charge of her security too. Palpatine knew this story would finish wrong, but he let him go, tired to hear him repeat 'PleasePleasePleasePleasePleasePlease!!!".
Yet, in all these years, Palpatine had manage another plan. The challenge of a popular Separatist movement led by the charismatic leader, Count Dooku, eventually became a threat for the Republic. As Palpatine, he was trying to solve the conflict by negotiation, but it was of course as Sidious, that he had given this idea to Dooku also known as Darth Tyranus. This was already arranged that the Separatists should finish to declare war against the Republic. If the project of the clone army wasn't already aprooved, then, to counter the coming war, the Republic would need a military, and Palpatine required the authority to activate the Republic's newly forged army of clones. To that end, senators loyal to Palpatine motioned that the Chancellor be given emergency powers to deal with the Separatist threat.
With spoken regrets (ahem! ahem!!!), Palpatine accepted the new mantle of power. He promised to return his absolute authority to the Senate after emergency subsided. What no one realized was that Palpatine would never respect his promise.
The Clone Wars then began. In some years, when the wars would be finished, all the galaxy would still be under the shock, and they would need someone to take the blame. The Jedi Knights would be this someone. As they always interfered in the galaxy's problems and as they always did more troubles than they solved ones, everybody would agree that they are the problem. The people would then let him kill them and without them knowing, he would take his revenge on the Jedi for all the Sith Lords, recreate the Sith Empire and rule as the Emperor of the Galaxy forever. Yes, everything was truly going as planned. Well almost everything...again.
As what Palpatine had first supposed, Anakin, who couldn't have just 'fun' with Padmé, decided to marry her. He yet knew that Palpatine wanted to kill her, but he didn't listen to him. Anakin then suggested to his father that it wouldn't be that worst. If she was marrying him, she had to resign from her job of senator, so no more political debates with her. Palpatine finally agreed to let Anakin marry Padmé, now happy to know that she would stop to bother him in the Senate. What he didn't realized was that she would continue to annoy him at home for probably the rest of his life.
Two years later, the Clone Wars was finally finished. The Naboo Bitch (Padmé) had to fell pregnant, of course, and not only to give birth to one child, but to TWINS!!! You surely know how much Palpatine likes children, well imagine how much he was happy to learn that he would be the grandfather of two adorable little brats. Yes, you already know their names: Luke and Leia. Padmé was now eight months and some weeks pregnant. Palpatine and Anakin were transforming the Republic into the Empire and had started to kill the Jedi Knights. During this time, Shmi tried her best to hide that to Padmé, but as Shmi is such a good liar, Padmé started to doubt that something abnormal was going on. When Anakin finally told her, she was very angry, but she finally accepted the fact of that dictatorship. After all, it wasn't going to kill her, even if it was Palpatine's first idea. However, the shock of knowing that provoked her delivery and she gave birth to Luke and Leia.
As what Palpatine thought, Luke and Leia grew up becoming real brats, running in the corridors of HIS Imperial Palace and giving orders to HIS Imperial Guards. In addition, they were calling him 'grandpa', one of Shmi's great ideas of course, what really annoyed him. Padmé, when she finally learned that Palpatine was the one behind all her assassination attempts, become more crazy, took the habit to endlessly argument with her father-in-law and started to call him the old dumb tyrannical wicked crazy narrow-minded wrinkled and ugly sorcerer. As if it wasn't enough, Shmi decided to adopt a redheaded little pest named Mara Jade. Shmi always wanted a daughter but couldn't have one: her wedding gift was to...well, be sterelized (you can see how much Palpatine ADORES children). Also, Mara took the bad habit to call Palpatine 'daddy' what is also greatly annoying him.
In fact, we can say that if they are all still alive, it's probably because of Palpatine's 'immense generosity', because even if they are all getting on his nerves, he doesn't seem to want to kill them yet. His intention was to recreate the Sith Empire, what he did, but the fact that he has a family is helping too. Of course, the other Force-sensitives of the family are not as strong as he is. If they were, he would already be dead since a long time, and they would just repeat what the other Sith Lords already did. After all, why would they want to take his place? He is the only one in this family who is really working! The other ones are doing absolutely or almost nothing and they are living on his money! It would be really crazy and dumb if they wanted, suddenly, to take his place...