Bruce Jenner and his wife, Kris, each had four kids prior to their marriage, and they now have two children together. At first blending the kids together was a big challenge. "Now we have an extremely good relationship," says Jenner.

He offers the following advice for stepparents:

• As a parent there are certain rules you play by. There's another set of rules as a stepparent. You've got to realize there are things you can do and things you can't.
• Take the first few years to define your position and learn how to play the game.
• Figure out how to back off but be there for the kids if they need you.