I must be a very lucky step-mother. My step son is intelligent, kind and easy going and never have I felt the least hostility or resentment from him. He lost his mother only two and a half years ago and whatever he went through, he did not act out on it. I find it hard to tell him off though! But I am getting better at asking him to give me a hand and to do his chores.
John on the other hand has more of a challenge. The girls push harder and test his patience a lot more. They are reluctant to respond, to help, to participate and to share and even more reluctant (one of them at least) to enquire of others how they are, feel, etc. Their world is quite narrow, at least to us looking in. One is almost tempted to label it shallow. But....part of me thinks that this is them going through that part of their lives and all that counts is 'mates' and having a good time and the rest of us are a bunch of nagging dullards.
Hope so. Hate it when those I love are not talking to each other.