I've been following the case a little bit, I used to follow van life stuff on youtube because there is a lot of good info for shtf like solar, rapid evac of your area with water/food/bed/shelter already available - all sorts of neat applications and heck, I hate rent too.
Some van life folks are making good money, nomad land movie too, ( filmed like it followed my life - I moved out of Gerlach, NV lived in my truck, went to near quartzsite, AZ )
The kids got a bad case of cabin fever, but, yes, she could be the bad actor here...but I doubt it
if he didn't kill her, why didn't he talk?
his disappearance at first made me think he was fleeing due to guilt but yeah, you guys might be right - a relative could have accidentally killed him while extracting information with enhanced interrogation techniques