Sleep overs

Absolutely I would need to meet the parents (this is our rule even if they are just playing at the house). I think there probably isn't a certain age limit, but my kids started around age 10-11

I'm not going to let my daughter go anywhere without me meeting the parents, talking to them, and getting to know them as much as possible. You just never know now a days. Kids to my house anytime after I get to know their parents. I would rather have the children come to our house first on the count of sometimes you can tell how a child has been raised by being around them. Usually that will reflect on how the parents are most of the time.