For ANY OF US to date someone that had no contact with our group-we would have to give up some of our responsibilities and commitments to children, grandchildren, pets and household.
This wouldn't be relevant to me because if my partner and I decided that we would introduce other partners to our families, I would trust that they would only consider doing that with people that are suitable to be around our loved ones. If he decided that someone was okay, I wouldn't need to meet them first to check myself. Them being at a joint activity of some description wouldn't mean I have to share space with them. It would be up to my partner to ensure his partner is towing the line. That's why they would be the person I chose to have kids with.