Need advice please. MIL playing my partner (her son) off against his sister (her daughter). She tells us that she doesn't see her daughter enough and tells her daughter that she doedn't see my DP enough. He has done so much for her over the last 5 years. He spends hours with her every week. My SIL sees her every day. They offer to take her out and she refuses then moans about being stuck in the house all day! She has now started telling her neighbours that she is all alone and sees nobody! The neighbours bought her a birthday cake and presents and cards because they felt sorry for her. She conveniantly forgot spending time with us and being spoiled rotten for her birthday! It is so manipulative but my DP won't call her out on it instead gets annoyed and takes it out on me! What can I do?