A joint venture is where you work with another person to create a product, and you split the results equally. IT doesn't, however, let you share files from one system to another. THe critical difference, including for DAZ files, is that they stuff is being used in a different location. If you and your aunt were in the same location, it wouldn't really be all that much of an issue. Since you have to switch locations, you'll need to purchase a copy of everything for both locations.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)