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The original was posted on /r/AmItheAsshole by /u/newdadpost on 2023-09-03 20:45:20.
My ex and I have 3 kids, 7f, 2f, 18 mo m. My ex also has a 20 year old daughter, Grace and Grace is engaged to her high school boyfriend, Liam (20).
Grace and Liam moved 6 hours away from us when they started college. When my ex and I divorced, she and the kids moved to be down the street from Grace and Liam. Since they moved, almost every picture my ex has posted or sent has involved Liam. There’s videos of Liam coaching my son through his first steps, him teaching my 7 year old how to ride her bike, Liam and Grace at the beach with the kids. It’s so common that I asked if Grace and Liam are living with them.
My oldest had a daddy daughter dance at her school. I was not notified. I found out by seeing a picture of Liam and my oldest on my wife’s Facebook, with the caption “daddy daughter dance 2023”. My kid has her grandpa and 3 uncles within 10 minutes of her but my ex chose Liam to take her to this event.
After seeing the post, I told her I am done with Liam taking over my role as the kids dad and that I’m not okay with him being alone with the kids. I told her that if I continue to see Liam pretending to be their dad, I will take her back to court for custody. My ex said someone has to fill that role since I can’t bother visiting (working to pay her child support and alimony) and only talk to them once a week at best (it seems that every time I call they have ballet, gymnastics, swim, nap, school, or are out with Liam).
AITA for threatening to go back to court because my former stepdaughter’s fiancé is pretending to be my kids dad?