I read through the divorce settlement multiple times. There were a handful of dates on it, all within a few months of each other. Surprisingly the start date of the marriage was NOT a date listed on his divorce paperwork. There was no alimony, and they had no assets other than her vehicle. No alimony - no assets to split. She kept what little they had and he left the country to go back to the UK.
As for asking his family - we asked his cousin, and she tried to get his parents involved. He's estranged from them and does not wish for them to be involved in his life anymore, so he is not willing to contact them. I'm hoping we don't need the EXACT date of when the marriage begun, considering we have the legal proof that it ended.