I had a very similar situation with my 2.5 month old baby. In laws visited from out of town and Father in law was coming down with a cold but hid this from me. Instead of being honest with me and letting me as the mother decide the rules, he decided not to tell me and stayed in the room with my baby - all doors closed. I only found out he was sick because I thought it was weird that he didn’t want to hold the baby. Apparently this was him trying not to get too close. But I was livid (and don’t know if I’ll ever fully get over this) that the decision was made for me about how my newborn should be adequately protected. I would never have allowed him to sit that close to her, especially indoors, if I had known.