Step Parenting: Can You Raise Another Person's Child?

When you marry someone who has children from a previous relationship, what are some of the challenges in raising someone else's child? It is more difficult when a child is younger or is it more difficult when the child is a teenager? What are the techniques you can use to win the child's trust? How do you avoid conflicts in parenting styles with the other parent? What if you just can't form an emotional bond with the child, can the marriage still work? How do you feel about someone else raising your child?