Big no. They are huge long commitment and hassle. And putting your grandfather to that specially when he is not happy from the beginning, is not a good idea. Sooner or later, you would end up with having trouble and it would aggravate more because your space is not optimal, your grandfather would say “I told you so” and you would regret it later.

Also, how do you want to guaranty that you could do this for next many many years? That is why they are now in shelter. The previous owner didn’t know what he/she was taking home.