Hi. Just curious at what stage you allow this. My eldest son is 22 and has had casual partners in the past. I've met 1 of them. Usually only lasting a couple of weeks 
so after meeting the last one, I said to him that I don't think it's best we invite them over in the future until it's properly established. He is now with a new girl. It has been 8 weeks. I have other children. 9, 15 and 18. None are particularly interested in meeting. 18 year old obviously knows the history.
Just looking for advice if we should meet them now or??