My ex SIL (30s) is in a new relationship with a 55 year old man who has several grown children and multiple grandchildren. They met in March. She went to mandatory drug rehab the past week and I've been keeping my teenage niece for a few days at a time while my brother works nightshift.
I became aware that my niece is spending a lot of time texting someone, and lo and behold, it's my SIL's boyfriend.
I told my brother and he wants to take her phone and beat the shit out of the guy, but so far the texts are "harmless" and the phone is the only way my niece can talk to her mom in rehab.
Niece is desperate to live with her mom and is pissed at her dad all the time. Custody is shared but obviously my brother has the kid most of the time right now.
I'm seeing all of this as a big red flag on top of a dumpster fire, but what the hell can I even do? Any ideas?