What do you guys think about it?

I have a 7 year old nephew and he is obsessed with coming into my room and stay with me but I have things to do like studying, so after a certain time I have to ask him to leave me alone and then he leaves. Also he has an annoying mom, she immediately gets offended when things doesn't go her way. My nephew tells her that I don't accept him in my room since I have things to do and she has a kind of attitude towards me. For example just now, I had to dry my hair so I asked him to get out and my nephew literally announced to every person in the house about how freaking long it takes my hair to dry. After I was done with my hair I was preparing to study and my nephew was still complaining to his mom and his mom also doesn't hold him back like she doesn't warn him at all, all she does is getting offended and attitude in the corner. My sister was talking to her and she said to his mom "tell her to accept him in the room" and his mom said with an attiude "I don't care, what can I do" I literally felt the attitude in her voice and it's just so annoying as if I have to please them. What should I do with these people?
What do you guys think about it?
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