I would suggest sticking with the one whos been there for you more. In the real world (sexist or not) its generally the mother. Its not always that way, but the mother is the one who stays with the baby when theyre born, and they are more often the ones that stick with the baby while the father goes out and provides for the family. And you should also consider who would need you more, too. My parents split when I was seven. We stayed with my mom, and Im glad we did. I have no idea how life would have turned out if we had stayed with our father. He loved us and all, but he dealt with addiction problems, and he was not someone who could show affection, and he was in no way tender or gentle. There are of course plenty of males who do have this side to them. But not my father.
Also, Crescent Moon Villager brings up a good point, they will probly date other people, and that part is not easy to deal with at all, at least it wasnt for me. Luckily, youre pretty grown up, so it wont be so bad for you now. But theres still the very uncomfortable feeling of having to deal with their new "partners", its not a pleasant experience. But, try to be accepting anyways, because refusing to do so will only turn them against you. Hopefully, the people they get with will be good people, and will be respectful of you. If they arent, you can try talking to your parents about them, and hopefully theyll listen to you. Luckily, my mother was good with this, and did not let her boyfriends treat us rudely. (there were still a few who caused some serious issues, though. Many of my worst memories as a child come from the guys she was with after my father left)
And dont let yourself take sides against the other parent. In my case, it was my father that was in the wrong, but I still love him and hope he does okay. My mother never turned us against him, though when we would talk to our father, he would try to do this on occasion. I would disagree with him respectfully, and make sure he knew that I loved both my mother and my father, and I didnt want to make any divide between them.
