I would like to ask about my family problem. My parents have been fighting for years. My father no longer talks to my mother although he tried to make amends once. My mother constantly talk bad about my father to me and my siblings. She is always full of hatred and anger towards my father. I'm afraid with time I'll begin to hate my father as well. What is the view in Islam about parents talking bad about their partner to their kids? Where should I stand in this? Thank you.
What your parents are doing is against Islamic teachings. What you should do is stay neutral and respectful toward both of them. If one parent does something unjust toward the other parent or toward one of the children, if you can help prevent it without causing greater harm, then you should try, without belittling or offending either parent.
In your situation, one thing you can do is encourage your siblings to think the best of your father so that they are not unjustly biased against him by your mother’s words. Since your father is not speaking to her and allowing the situation to continue as it is, it appears that both parents are responsible for the bad situation, therefore it is best to not take sides but try to be fair toward both.
If there was anything you could to improve their relationship, then that would be a good thing to do, although it is unlikely. Anything you try could do greater harm than good, since they are older than you and know much more about each other than you do.
Please also see my answer On Islamic Manners Toward Parents.