I honestly don’t know the answer to the question I’m about to ask:
Was this known before?
They were married in an Episcopal Church; was a priest there?
I don’t think it ultimately matters all that much, but this does raise the question as to whether they are married in the eyes of the church.
I sincerely doubt he would have made his older children bastards by obtaining the necessary annulments. So, at best she is a cultural Catholic; it doesn't matter to me as long as she is a Christian and a believer by faith in salvation by grace.