Definitely agree it's not the only answer. As far as the grandchild goes, that's where epigenetics and generational trauma can play a very interesting part/conf

Definitely agree it's not the only answer. As far as the grandchild goes, that's where epigenetics and generational trauma can play a very interesting part/confounding factor. There could be a straight up heritable trait that causes this, or a genetic+environment mix, or even just a straight environmental influence. I'm fortunate that most of the people I know who have trouble with this are capable of somewhat keeping it in check, although there are certainly some garages/basements in my extended and in-law families that are going to be an absolute nightmare to deal with down the road. At least for the folks who live on farms, it has occasionally come in handy; while a ton of it is just straight up junk, they do seem to have a pretty good mental model of where things are even though it isn't really organized and can often dig up very old obscure parts for equipment (farming or electronics) relatively quickly.