There are lots of good things about living in a stepfamily:
You are part of a family again. You may feel safer. It's good to see mum or dad feeling happy with a new partner. There's another adult to talk to or do things with.
There may be more money in the home, so life could be easier. There may be new stepsiblings to know and play with. You may have lots more relatives to care about you (and maybe even buy you presents!!) You may even have a new brother or sister to love.