I live with my husband and his mother. My mother in law seems to have issues

I live with my husband and his mother. My mother in law seems to have issues with me; she picks fights and tries to manipulate my husband into treating me like dirt just the way she does. She is more than just a meddler. She seems to have strange episodes that might qualify as a mental problem such as depression. My husband always takes her side and goes crazy on me saying that his number one responsibility is to his mother. My question is what is the morally acceptable thing here? Does my mother-in law deserve more of my husband's 'respect' than I do? It seems that he thinks I should never say ill about her even when she's clearly in the wrong.

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