Hello Friedgen:
Good to read your post. Look: what you do is ENTIRELY your own business. You have spoken with your children about it, and there the matter rests. You are an adult woman, who has been married, has two children, and (pardon me) it is not your mother's place to tell you what to do or not to do. I also think her remarks are way out of line (standards too low indeed!!). I am right on your side, Friedgen, and in your place I would be very very indignant indeed. You are perfectly entitled to meet this man, to make new friends, to meet as many people as you like in fact. (Thankfully, the dark ages are long gone LOL).
Sorry to hear your in-laws had a fight in your garage last night and that you were upset. Well, that (and their possible divorce, or otherwise) is THEIR problem, and should not be a burden for you. Nor should you be required to step in as a referee. You have enough on your plate as it is.
I am sure your great good sense will take you through all this, and much more, Friedgen. Be your own woman, listen to your own instincts, and switch off the "radio interference" from others. LOL.
All the best
Seven