We adopted Casper back in January, but it became very clear very quickly that he wasn't suitable for a home with children. He bites and scratches all of us, and unlike other cats I've had it's unprovoked and without warning. My DC learnt very quickly not to go near him - they're frightened of him - but he would still sometimes jump out and bite them as they passed him. He seemed to get particularly territorial about the stairs anf would attack them as they went up or down.
We contacted the rescue who were very apologetic and said they would rehome him and we were welcome to chose another of their cats. They've now got someone who's interested in meeting him and possibly adopting him.
Thing is - I've grown to really love him, in spite of his behaviour. I think it is getting better, albeit slowly, and I think it'll get better again once he's allowed out (he's desperate to get into the garden, and I think a lot of the biting is frustration-based). And when he's not biting he can be so lovely. When I come in the house he comes straight over and demands to be picked up for cuddles. He gives me kisses, he loves strokes and attention, and he's very "talkative."
He's very much become "my" cat, which is part of the problem - he was supposed to be a family pet. I know him going to a child-free home is probably best for everyone, but it's breaking my heart.