My parents are thinking of splitting up. I'm not sure what to do.?

My parents did this to me when they divorced. There are things about both of them that I never needed to know. Tell them you are not going to listen, And would appreciate them not talking to you about each other at all. As far as your siblings they will be OK. It sounds to me like your parents have stayed together for the kids. Your moms is probably thinking with your brother graduating and you capable of taking care of yourself, she can be on her own with your little sister.