So I have a question for you ladies. My husband has a child with another girl and well we have full…

So I have a question for you ladies. My husband has a child with another girl and well we have full custody of her and we don't have to let her see her biological mother because she has been on drugs and lives with her drunk boyfriend...anyways the last few months we have been letting our little girl to go see her bio mothers mom and well they started getting power hungry and controlling so we stopped sending her down there and now I keep getting hate messages and her grandma is posting rude things about me on Facebook and my husband just doesn't seem to care....I've been so emotional about it lately and I have no clue what to do or say or anything to him cuz when I do he gets really pissed and ignores me for the rest of the day. What should I do or say to him to get him to understand what I'm going through?