1. Certain details of that story don't add up at all.
2. If it's true that he cut off all contact during his time with his son, that's foul
3. If it's true that he disappeared and kept the kid longer than he was supposed to with mom not knowing, that's foul. But...
4. She still should've let a son go to his father's wedding. If you not comfortable letting him go by himself anymore, that's fine. Tell that nigga you're no longer comfortable with letting the kid be with you unsupervised and that y'all need to go back to court. But in the meantime, he can fly you BOTH out so you can feel comfortable with it. But I know everybody ain't ready for all that. But if the alternative is NOT letting a son attend his father's wedding, it's something to consider.
But if she wasn't with that scenario, I'd understand.