17 Dec You do not want to discover that the youngest also gets to sleep in your marital bed, meals are in front of the T.V. or the kids can come and go from the house without permission if you are dead set against such things. Once you have put your parenting structure in order, turning it into a supportive, loving. Everybody must knock on closed bedroom doors before entering (even little ones 2 years old can be taught this). Stress that just knocking is not enough — they have to wait for an answer! Assert your need for private time. This is a problem not just for stepfamilies; kids the world over seem to have “sibling prevention” wired. Blending two families? Get tips for easing the transition, bonding with stepchildren, and dealing with common challenges.