I guess, piecing it together, it doesn't make sense to me that both of them would have drowned, especially if they were out of the car. (Even the 'falling asleep in the car and being washed away' never really seemed plausible, either.) If they were out of the car, I'm trying to picture the scenarios in which they both would have drowned, and I simply cannot. Now, could she have been abducted and the boy drowned (intentionally or from being lost) -- that is possible. But, I fear that it went something like this: mom's life started to spiral out of control again and in order to "save" her son (in a warp, twisted way), she drowns him and then goes off to leave everyone behind. That is my biggest fear...and I pray I am wrong.