My son 22 is obviously having a female friend stay over regularly. He lives in my garage conversion and so has his own door but not fully self contained as he has no kitchen. He denies their staying but I am pretty sure 7am is too early for someone to be leaving after coming for coffee. I have asked to be introduced just because they are in my house but he is refusing and caling me names for it. Am I unreasonable to say introduce the friend or get out? Surely it isn't so hard?