I'll make this quick! My boyfriend and I are both in our 40s. I have three kids under 14, and he has three, with the youngest being 12. Their mum left the kids years ago, and my boyfriend has been raising them since. He has had a few girlfriends, but nothing serious. The 12-year-old was a toddler when her mum left. She sees her mum almost every weekend. Mum moved in with another man and had more children. I came along late last year, and the 12-year-old blows hot and cold with me. She is constantly in a mood with me and her dad. He says she was like this even before I arrived. She is such hard work and can't regulate her emotions; she has tantrums, screams, etc. He says this is normal and she's acting out because of trauma and abandonment issues with her mum. I totally understand that, but she is just so difficult to be around and I feel like I'm constantly on edge. We haven't introduced our kids yet, as it's only been 8 months, but I am constantly told her rudeness and tantrums are a reaction to her mum abandoning her. I am torn between whether he is always making excuses for her or if she is truly a troubled kid. I work with vulnerable children and have two autistic kids, so I wonder if I am just exhausted with her as i'm already surrounded by vulnerable kids or if I am being unfair. She has two older siblings who seem to do everything for her—they were older when her mum left and have taken on a surrogate mother role as dad works long hours. She doesn't do anything around the house; the oldest two do everything including tidying her room for her. They have their own issues, but he never makes excuses for them. I hope this all makes sense?! I suppose I want advice on what to do? When I have mentioned she kept whispering things to me and then giggling to herself he said I need to give her some time as she is damaged from her mum. She seems to enjoy her mums but says she is jealous of the attention her step-siblings get and always comes back in a bad mood. We do not live together and only usually see each other when the kids are not with us.