I would say that if you live on site, in one of the units of the rental property, then no, you are not a parasite. So, live in one side of a duplex, or in one unit in a quadplex that you own, no problem. But, if you’re renting out a unit where you don’t live, you’re some degree of parasite, yes. Maybe you’re just an an annoying little gnat, rather than a 40’ intestinal worm, but yeah, you’re still a parasite.

There are other, less-parasitical methods of investing involving real estate. Your aunt could offer the propert(y|ies) for sale with a private mortgage, or under a “land contract” (a sort of rent-to-own arrangement). Because equity is transferring to the occupant, and the terms are fixed for the life of the agreement, this arrangement is mutually beneficial, rather than parasitical.