Barklyboy, you and your ex-wife have behaved badly with regards to your divorce and your sons. Except when there has been domestic violence, there should be no reason not to stay civil with one another for the sake of your children and family harmony. A wedding is a prime example, it should be a day of celebration for everyone, your sons only have one mum, one dad, it's a sad situation when your son feels he has to exclude you for fear of upsetting his special day. You and your ex-wife should have put in more effort over the years to put your animosity towards one another aside, special occasions will always be awkward otherwise. Maybe you could take the opportunity to offer an olive branch to your ex-wife for the sake of future events - weddings, birthdays, christenings ... I'm sure your sons would be delighted to have their parents present for family gatherings, it shouldn't be too much to ask. Good luck 🤞.