When I was a kid, we moved across the country to open a new church and bought a house from someone in the same church. I can tell you, that every single thing that went wrong was because of things "they" did. The carpet didn't last because "they" bought cheap. The wiring was bad because "they" messed with it. The trees didn't grow because "they" hadn't planted them right.
I would never buy a house from someone I wanted to have an ongoing relationship with. And I wouldn't want to live next to someone who bought my old house. Just a few things to consider. The personal relationship will very likely interfere with neightborly relationships.