Mother in law came to visit

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So my mother in law came down to visit because I recently gave birth to my little girl and she's in the nicu.So she came to help out. Well the problem that I'm having is my boyfriend has a son and he never listens to me it's always a struggle between him and I . So now that his gramma is here he thinks he can do what he wants and when I try to tell him something he just walks by his gramma and just looks at me because she babies him a lot . Last night he was trying to do things me and my boyfriend don't allow him to and my BF mom was like leave him alone come to gramma. And just right now he told my mom give me water now . I kinda feel like my house is being taken over by him