It may be just my curiosity, but for some reason I don't think GGF is in as bad of shape as people would like us to think he is. He can be in his 70's, have declining health and early stages of dementia, that comes and goes. IIRC, JM stays at home with him during the day, hired by her Mom to do so, right?
Well, this could be a two-fold solution, someone is with GGF and it also gives JM an income without going out to work and paying a babysitter. If GGF health is so poor, why would JM and DK, Sr. even think about going off to explore for those 10 minutes and leaving little Deorr with GGF?
GGF has to be in better health, both mentally and physically, since the parents felt it was okay to leave toddler Deorr in his care! Hmmmmm