First argument with husband.

Husband decided to help his nephew (8 years old) and take him to live with us.

Kid's mother got into trouble selling drugs and is stuck living on her mother's basement. There were 3 people living in the basement: nephew, his mom and his aunt, all in the same bed. Kis is always playing video games.

Now, his father has been using drugs and the kid knows it and is pretty upset about it.

Well, husband decided to take the kid so he will be around a more consistent environment without sleeping with his mom and aunt and all the drama.

I asked him to discuss with his sister ( kid's mom) so we can all be on the same page. Honestly, I don't want her coming over all the time. I just had a baby and even though she is trying to get her life togethet I do not trust her.

Today she texted that she was coming over to do homework with her son. He spent the weekend with her and came today to our house. I understand he is her son, but I just don't want her here. It starts with one day a week and in no time she will be staying over...

Anyways, I just want to come home to my baby, spend time with my mom who is helping me and spend time with his nephew...

He says that I am not understanding and her being here would not affect me because she can be in the basement with her son..

Am I exaggerating because I don't want someone with a criminal record and history with drugs to be at my house that often??

Please be honest. I want to see all perspectives on this. Help me understand what I cannot see right now.