CC, Here's what I would do. I would say to h "h, in the future, when you are doing facetime w/the kids, would you please make sure that people in the background keep it down a bit because the kids can't always hear what you have to say and this also alleviates any questions that they may have about who is there w/you". Then leave it at that and allow him to panic and jump through hoops a bit as to what you actually heard or saw. Sometimes when we drop a few crumbs, they will stumble all over themselves to find out what you know.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.