...you do see them together at the end but I just meant that there is some ambiguity in exactly how the father ended up drowning. It could have been the wife coming for him, or one of the other drowned people, or the whole gang of them...
I also thought the ending was sad, but in a bittersweet kind of way: The father gets his wish to be back together with his wife but must lose his child to do so. I was then nervous through the whole flash-forward scene of the new happy family at the end that a cold, black hand was going to reach up and pull the little tyke under.