My number 1 theory is that Ron & Misty were not together on Sunday and she wasn't with him on Monday morning. (not sure where Misty was but she wasn't with Ron) Ron spent all day looking for Misty. Couldn't find her. Ron had to go to work and locked the kids in the house with a movie. Ron then went to work. While at work continued to call Misty, after not being able to get a hold of her he calls mommy who gets GGS to go over and check on the children. Maybe GGS found HaLeigh unresponsive, called TN, who got a hold of Ron tell him what happened. They needed Misty at the MH b/c they also needed the help of people she knew. (her brother and cousin) If they told Ron to come home from work it wouldn't look good. He was at work. TN calls on another male family member to dispose of HaLeigh before Misty got to the MH. Misty then arrives to be coached on what to say and why. Misty not being the sharpest tool in the shed, goes along, b/c they told her they could get Ron to marry her, Ron would love her forever. Tom and Joe came over to remove the drugs and guns, they were probably told they could have a cut of what Ron had. Once everything is removed, Tommy is told to go back home, TN & GGS leave and Misty is left in the MH with JR. ( I guess at one point JR had to be removed from the home to avoid him seeing and being able to tell what happened to his sissy and who took her) Ron comes home, and they call 911.... I know i am missing loads of stuff.
This explains Ron insisting he locked the doors. He knows they were locked b/c he wanted to make sure the kiddies were safe. I have left out the part of how HaLeigh died, and that is b/c i feel it was accidental drug OD, or close head injury, could be something else, who knows. Ron could have drug the children and locked them in the MH, sleep before he went to work. It explains why TN called Misty and asked her to baby sit, the obsessive calling of Ron to Misty, Tommy being there and possibly Joe. Not sure if Timmy would fit in at all, but i suppose he could.
I just have a hard time believing that Misty was at the MH all day lovin it up with Ron and JR sleeping all day. it sounds all made up to me. TN, GGS, Ron, Misty, Tommy, and possibly Timmy and Joe could all be in this up to their eyeballs. (several POIs)
These are JMO, stayed tuned there will be more theories