Parents should monitor where their children are, developmentally, and make decisions from there. For elderly siblings, friends tend to act as companions while siblings play the roles of confidants. She sleeps over at his house every Saturday. People are encouraged to stay in contact and cooperate with their brothers and sisters, but this is not an obligation. However, even the most conscientious parents can expect to see sibling rivalry in play to a degree. For instance, there is evidence that communication about safe sex with a sibling may be just as effective as with a parent. He is not so sure about it as she is his stepsister, so that would be wrong on so many levels. If a child expresses concern about privacy, families will benefit from taking those concerns seriously and work together to find an appropriate solution. There isn't a specific age cutoff that requires that opposite-sex children separate rooms. Often, siblings will communicate indirectly through a parent or a mutual friend of relative. How can parents deal with the situation if they just don't have enough room to separate them? To them, it's more than romance: First, one must determine if the questionable behavior is age appropriate: Throughout the lifespan[ edit ] Infancy and childhood[ edit ] A relationship begins with the introduction of two siblings to one another.