Me too...as in when her brother was there they could have left with the kids in the van, and the blanket too for that matter, and gone somewhere else where something happened. After that time, we have the main inconsistencies begin. Grandma's visit not mentioned, then coming out of nowhere to "witness" Haleigh and RJ at home. Then add in the staged door, the blanket washing story, the bathroom, drink, Haleigh got up, Misty got up etc.
My worst vision is Haleigh somewhere wrapped in the misssing blanket as a result of anger, abuse, or accident. After that point, they could stage an abduction and blame the cousin that Misty already has reason to hate and with whom Ron recently had an altercation.