I can understand your feelings about Vince. The incident with your older brother raises unanswered questions that need some closure.
I can't clearly locate it all in time, so I really cant say when Terrie may have divorced Vince.
And, I do not think I knew any called Langbroek.
The brother who told me about Vince died not long afterward. He was quite angry about it all.
I'm rather surprised that no-one else seems to know anything about Vince's history. He's one of the genuinely complex people who have been JW's. Most of the brother's I've known are rather straightforward. But Vince was complex.
It would be interesting to know more about his young life in a Catholic orphanage.
Was he sexually abused? Maybe by a priest? That may explain his leaving that church and becoming a JW.
But Catholic attitudes concerning religious devotion and repentance may inform his JW activity.