I guess the reason I would like to know the most, even if H were still to choose the OW, (even if the baby wasn't his)would be for some kind of closure, but also if he is going to tell the kids , which he is, it seems like to definitely know would be the best. This is going to be a huge blow to them anyway. After all you are telling them they have a sister, amongst other things.
I'll have to talk to the lawyer about this. Thank you for your imput.