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Cary's advice is great, as usual. I have another idea to add to his. Find something you can teach and share with those kids. I had two step children, a boy and a girl. The little girl I taught to swim, since I used to be a swim coach. Just the two of us used to go to the pool during the week, and I would teach her to swim. I used to read to her all the time as well. The boy I used to ride BMX bikes with. I would take him to a local track, he could watch me wreck, and we would have a great time.
For a family activity we used to all gather round the stereo at night before bed, and we would rock out and dance. I introduced these kids to all types of music. We covered everything from Soul to Punk- and there is nothing like watching some kids bounce around to The Ramones. It became something we all looked forward to.
So perhaps you can find some age appropriate activities that you can share. That might lead to friendship and perhaps love one day. I remember loving my step-dad, and I remember loving these kids. It is possible.