I have no idea whether or not Kennedy got an annulment...but children have nothing to do with the decision....if you have several children, and discover that your wife was still married to someone else, or your estranged adopted sister, or your first cousin by a long lost uncle....the annulment could be granted.....these couples need not become enemies, just realize that their marriage has serious religous problems.....they probably could remain a chaste couple, best friends....whatever.
I remember that happened and that was one thing that turned me off the Catholic church. How can that be when several kids were involved? Never have understood that. It just seemed like money could buy anything in that church.