if my parents want to divorce and i decided with my brother to live with our mom who shoul support us financially?

I'm sorry that your parents are divorcing. They obviously care about you so much to ask your opinion about the living situation. I hope they will talk to you about not worrying about finances -- this is definitely something that your parents are going to work out among themselves and something you should not be worried about. However, the law does ask that the non-custodial parent pays child support until you turn 21 years old. I would encourage you to talk to your parents about your worries so that they can help you feel better about the situation. Good luck.