<human>: Can you condense the text into a few key points?

My dad is divorcing my stepmom after 13 years of marriage. they have a son together, my little brother. He's 8. He's always been kind of a little sissy, and always loved having the family around together. Im not sure how he's taking it because I'm away at college.
The main issue is that my dad has told me that my stepmom has been saying really hateful and mean things to him, posting them on his fb, etc. She's extremely hurt over the divorce and still wants to be together. 

However, it's hard for me to be nice with her and talk to her when I think about the things she's said to my dad and how she's making him feel. I know its not my business what goes on between them, but I find it hard to be nice to her and want to talk to her when she's giving my dad a really hard time. And I want to talk to my little brother, but he lives with her most of the time.
How should I proceed?
<bot>: It's uncomfortable for me to be nice to my stepmom because of the way she's treating my dad during their divorce, but I still want to talk to her and my little brother