(a bit of background) my bio daughter lives with me and her step dad (she calls him dad as she’s known him since 3 months old and is now 2yrs old and we have a 2 month old together) his other daughter 5 comes at weekends, usually a very kind girl, a pleasure to have and be around. But this morning and yesterday was being a completely different kid when dad wasn’t in the room so I set up my phone to record what was going on when they were playing in there room together (in fear of not being believed) showed the recording to dad and could hear daughter 5 saying to daughter 2, “want me to push you AGAIN?” “You better not tell” and telling her to bite herself on her arm, (daughter 2 is struggling with emotions and when frustrated will bite her arm or hands) daughter 5 has heard us mention this. Dad dealt with daughter 5 and she cried and said she was sad she had been caught and didn’t think she would’ve been. Texted daughter 5s mum and she denied her daughter would do this, so sent the recording, she was more concerned why there was a recording. Anyway. Daughree 5 was sent to nanas house to be collected by mum and is saying she dosent know why she’s done this but has told dad she is jealous of daughter 2 and daughter 2 months, Daughter 2 is scared to play in her room now and is telling us things. Mum is now saying she dosent want her daughter around mine, so not sure how visitation will work now. We have a newborn, we can’t supervise 24/7 and are worried these incidents will escalate as nobody else is dealing with it. I have suggested she dosent come back until she has been to councilling and dealt with whatever her issue is, because listening to the recording it was just nastiness, pure nastiness even the tone. On here looking for suggestions or any advice tia x