I like chatting with my stepdaughter (15) about current events, history, politics, the content of the TV she watches, stories about her pals. The quality of the conversation has improved massively over just one year. It's nice to hear what she thinks.
As her confidence with different tasks grows, so does her creativity. She'll make herself whatever small meal she fancies, while my 8 year old DD still waits for me to make her breakfast and get her a cup of water. 🙄
She's developed special bonds with each of her younger sisters (other FF is 4). She gives pep talks to the 8 year old about dance exams, and is the only one my 4 year old will allow to trim her nails.
So far, we've been lucky, in the sense that when she does clash with me and DH, she responds to natural consequences. And she's not lying (afaik) or sneaking out (afaics) to be self-destructive and rebel.
The downside to this is she has a lot of confidence and anxiety issues. She needs a lot of hand-holding with things like applying for a job, speaking up for herself, studying, college applications. She has pals at school, but no close friends, and none of them have ever come to our house, where she lives every day. She has panic symptoms at school, but won't contemplate speaking with a counsellor, even though DH and I have both gently brought that option up. We still worry. 😕