So what is “ours” is ultimately God’s, including whatever he gives to us. But that is every bit as true here on earth as it is in Heaven. And the fact that God owns whatever is “mine” does not mean there is no distinction between what I own and what others own.  

No. Angels and human beings are entirely different creatures.

“Let temporal things serve your use, but the eternal be the object of your desire.” Thomas a Kempis

Think about the person you would most want to spend time with. Who would that person be? Your favorite singer, author, or athlete? Your best friend who moved away? A family member who’s already died?