The Fountain and 1,000 years of cozy togethnerss in a bubble floating in space

In anticipation of Netflix jacking my monthly fees, I'm devouring as much of their stream-now offerings as possible. Ran across The Fountain and am halfway through it. The story takes place over 1,000 years and seems to be about a guy and a girl who live together (maybe their souls live together?) in a bubble floating through space. The bubble has a tree, a stream, some rocks and looks kind of like a spot on the back of one of my high school friend's farms. I'm not through enough of the film to understand entirely the parameters of their existence, but they seem to fade in and out of real life, occupying different personas, but always in a way that they are connected.

This all sparked the thought. If you could choose one person to spend the next 1,000 years locked in a bubble floating through space, maybe with random visits back down to earth, but maybe not, who would you choose? Spouse? Mother? Father? Son/Daughter?