Welcome back! Siblings are your ride or die in most cases, but what happens to the dynamic when an outside force changes that?

First story: https://www.reddit.com/r/AmItheAsshole/comments/12ozywk/aita_for_putting_out_my_fiances_exwife_her_two/

Second story: https://www.reddit.com/r/AmItheAsshole/comments/10dc3uj/aita_for_not_paying_my_daughter_to_babysit_her/

See you next time, Ciao!