At this moment, just flying in and out on a 90 day tourist visa still works because my wife's parents are still healthy enough to just need attention every couple months however it is very clear that in the near future (we think within the next 2 years) we will have to temporary live in Japan until they pass away. This could be a few months or more than likely a few years. Dementia is usually drawn out process. We have NO intention of living in Japan forever but during the period of elder care, I do not want to have to fly in and out for the sake of a tourist visa.

I was under the impression that blood was thicker than "maple syrup" so if I establish my residency with a Nikkei visa then I can stay as long as needed if needed without having to worry about length of stay.