My step daughter is 2.5yrs old, met her when she was just over 1, and the past few weeks she has shown a sudden, strong dislike to her father (my bf). We have her EOW and Wednesdays for a few hours and every time he picks her up she will scream as loud as possible, hit, kick, punch, scratch, she even scratched his face that much that he was bleeding. She refuses to have him anywhere near her. She has become extremely clingy to me, to the point where if I simply stand up she will shout my name. She will hit her dad and tell him to go away if he goes near her, and closes the doors on him so it's just me and her and will push at the door so he can't come in and shout if he tries. She won't play with him either. She has been calling me mummy recently almost all the time too. Her mother has had a new baby a few weeks ago, could this be affecting her behaviour towards her dad in any way? What can we do to help stop this behaviour towards her dad? I spoke to her about the hitting and asked her why, she said "daddy is nasty" but I can't imagine how. It's hard for him as she will scream if he sits even remotely near her. Any advice on what we can do?