He’s attached

My son is VERY ATTACHED to his aunt [my husbands sister] he thinks she’s the holy grail to the point where he thinks it’s perfectly fine not to listen to mommy [btw he’s 4 1/2 years old]. It doesn’t help that when he gets from school at 11:30am he’s at their house all day until I’m home at 6pm. I’m so tired of it I don’t know what to do but I don’t have family here to help with him sometimes and give him sometime away. Any tips? I’m so extremely irritated with the fact of all this. He’s been attached since birth she’s always been so helpful but she’s so irritating also. Maybe it’s just me, I’m grateful for her help I just don’t like the way my son acts when she’s around and not around. My other 2 children [3 1/2 and 1 years old] don’t do the same as he does with her.

HELP ME !!!

Ps my husband notices too he doesn’t like it either but we don’t know what to do. Oh