The home is a physical place in "Sonny's Blues," but it's also an idea. It's a place to escape from, a place to return to, a place with both horrible and wonderful memories. Home is comfort, conflict, grief, suffering, and caring all rolled into one. It's an apartment and it's a nightclub. Its residents are actual family and created family. Home is literal but it's also symbolic, since in many ways home is simply the feeling that one belongs.
Home is a tough place for these characters. Living in Harlem traps them.
Home is more an idea in "Sonny's Blues" than an actual place. Home is where you can always come back to, no matter how badly you've screwed up.