Bros being like they shoulda just killed her. Nah it's like the father instead of just chopping off his head it's a slow tortuous death from sleep deprivation, sometimes letting the person live is way the way crueler option.
He's aiming for a location where she can move about freely without needing a wheelchair, there isn't alotta options on the cheap side that fits that though.
How the hell are people wondering if the mom's still alive, it literally says it's been 50k years. literally no reason to even think she's still around.