So yes, the odds are pretty good that ultimately some survivors would be able to reconnect within the small community that exists.
I do agree that it's not that incredible to have met again, but to have started new families and have their grandchildren get married to each other, and have never seen each other until the day of the wedding, then, that I do think is quite incredible, but maybe the odds are not quite as astronomical as it first seems, as Mark also pointed out.