My kid's mom came forward about her own past abuse and everything has gone to hell.

Sorry if this isn't the right place to post this, I'm drowning in my thoughts and felt that writing them all out and getting input might help calm me down.​My daughter (6) has been living full time with my wife and I (22 and 24) since the beginning of last year. Her mom started dating someone who turned physically violent and after two investigations into violence and drinking in their home, CPS and the courts determined that our daughter was safer with my wife and I. Her mom stayed with the abusive person and was convinced that they could make it work if they stopped drinking (which was a factor, of course, but violent people will be violent whenever). In the meantime, I agreed to time sharing at my daughter's grandparents house, her mom's parents, with the stipulation that all time sharing had to take place there under their supervision.​Saturday my kid's mom got beat up by her partner again, and revealed that her dad had been molesting her since she was little and stopped shortly after she was pregnant with our daughter at 16. I was so sorry for her when she told me, but then I started thinking about all the times we had used her parents as babysitters, sat together at family events, relied on them to help with my daughter. About how incredibly irresponsible she was and how much danger she put our daughter in by not revealing this sooner. I told my lawyer as soon as I found out and she told me to stop any unsupervised visits and especially at the grandparent's house. Apparently the entire side of the family has known about the abuse for at least the last six months, and nobody told me or gave any indication that things were wrong. I do not trust them at all to keep my daughter safe and I feel so angry that they would try to sweep this under the rug.​​How do I explain this to my daughter in an age-appropriate way? Should I try to at all? She is very precocious for her age as a result of the hardships she's gone through these last couple of years with her mother. She already knows that her mother has been in a violent situation and she misses her often, she tells me so. How do I explain that she won't be going to grandma and grandpa's house or staying with them anymore?I'm sorry if this is above reddit's paygrade, but writing this has been somewhat therapeutic so here we are. via /r/Parenting https://ift.tt/3vSgXjt