GF & Her Son Demands I Kicked My Daughter & New GrandSon Out Of My House, Guess What Happened.. AITA

I am 46m living with long term girlfriend (39f) her son (17m-18) My girlfriend works as a middle school teacher while I work as an engineer, and I own the home we live in (I inherited the home).

I share 50/50 custody with me ex wife and she called me on a Wednesday telling me I needed to get our daughter(17f) early. We go week by week, so this was very early and I asked if everything was ok. My ex told me our daughter was pregnant and she was fine with her.
Story 1:
AITA for taking in my daughter full time and kickinng my girlfriends son out?
Story 2:
AITA for leaving my roommates kid home alone? I told him I couldn't babysit because I had work. He asked me to just stay home and I didn't.
Story 3:
AITA For letting my brother and his family be homeless?
Story 4:
AITA for telling my brother he can't comment on our parenting choices if we can't comment on his?
Here a link to my Relationship Advice Channel: https://www.youtube.com/channel/UC30IScb7PwuUc-2fFacMG3w/
#AITA #Parenting #Family

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