I don't force my daughter to interact/welcome the children as they arrive. I have only ever had 1 instance of a parent trying to correct her and she turned to the parent and flat out said "you're not my mommy" and walked away from her with out another word. IMO our children are NOT in any way obligated to interact in any specific way with the day care children. This is their home and if they don't feel like saying hello or anything else 5 minutes after getting up then they don't have to. But that is just IMO.