Some background. I 20F met my friend E18 when I was in high-school. E has a sister A16 who I met through E. I have a closer and stronger relationship with A. Me and E have ADHD. E uses her ADHD as a reason for everything bad she does. A lives at dad's E lives at mom's. When ever anyone talks to E if it's not about something to do with E she dosnt care and will talk over people. She complains that non of her teachers help her but she dosnt ask. She acts like the world revolves around her

One evening I got a text from A asking if E had come complaining to me about something. I said no and asked what was happening. A explained to me that when she was at her mom's. She asked her mom to dish Es food. Sending E to have a tempertantrum and almost leave the houseE can eat enough food for 2 grown men and dosnt save enough for others I then messaged E asking what was going on to hear her side. She told me A was being cocky. I then explained to E that A has a point. Then explained that she eats and dosnt save for others. E then got upset at me and said if I and A had a problem with her eating to leave her alone. I then snapped and told E that she needs to me more consideret of others. I then told her that the reason I don't see her when I go visit A is that I don't wanna deal with her tempertantrums. I told her that she is 18 and if she wants to get a job and graduate she needs to acts her age. She then stopped talking to me.

I told my bf 35M all this. He has said that I shouldn't engage in conversation with E till she apologies.

I couple weeks later A texts me asking me not to talk to E. I asked why to make sure I didn't overstep. A then explained that I didn't overstep and that E is hiding behind there dad,her age, and her ADHD. E is walking all over there mom and dosnt listen or care. A had seen that E had there mom as fing bi*** in Facebook messenger.

AITA?