I have been with my partner for a year now and we live together with his DD who is 18.
My partners ex-wife left him after she had an affair and his DD pretty much cut off all contact with her from this point and it was very much just the two of them so they are close.
I've never tried to be a mother to her, but I've tried to be her friend without pushing friendship on her or expecting it to happen over night.
I think ultimately long term I'd like her to see me as an older sister type role and if she does decide to keep her mother out of her life then she could look at me as someone to confide in. Sadly she barely speaks to me and my partner even commented that he thinks she sees me as a threat (and that she would feel this way regardless of who he was with).
She is in her last year of sixth form and has decided to go away to uni, one which is 2.5 hours away. My partner has brought up the subject tonight that he is thinking of us moving there too.
I have no idea what his DD thinks about this and I'm not close enough to ask her, and whilst I would never to interfere in their relationship, aibu to think this is an absolutely ridiculous idea?