ok, so i got the idea from those commercial family phone plans that allow people to share a single plan or discount.

The way these Aetherytes would work, is after paying some sort of housing upgrade fee, you can use your own house's aetheryte to teleport to the other houses with aetherytes on your friendlist or if they are married and have a second house.

Basically, unlike the standard world teleports, these would be listed more like how local teleports work in the main cities, but only for people who
1. are on your friendlist and
2. have a house that also
3. has its own aetheryte

I'm open to suggestions for variations on this idea