Yep, totally, if a child is doing something that I won't allow my kids to do. Like Marks neices jumping on Noah's bed. I tell them to stop. I don't care if they are allowed to do that at their house, they can ruin their own furniture, not mine. Hey it's not like I live in a place with awesome furniture, Sarah can vouch for that, but it's ours and we expect it looked after. What rule allpies for one child applies for all. Although, you would expect those rules to differ slightly when the child is a toddler to a 3 or 4 year old. Or the punishments handed out.