I grew up in a small, mostly rural county in SE Illinois. One of the things I've noticed, and have been looking for actively the last few years, is the different ways people in the community were connected.
Of course, there were your blood relatives. Then there were your in-laws. The next degree of connection was to your in-laws's blood relatives. Legally no relation to you, but sometimes the connection could be fairly strong. Then there were the connections formed at church.
There were two elderly ladies who Dad and Mom frequently gave rides to church on Sunday. Maggie, the oldest, and first to pass away, was the grandmother of one of my first cousins' husband. Her nephew was the church janitor; her niece's son was one of my high school classmates. After Maggie died, we gave Sunday rides to Minnie. Minnie's younger brother (20 years younger!) was married to one of Dad's first cousins.
Then there were two elderly sisters we saw regularly at church, Lucy and Mabel. Mabel's son had married one of Mom's best friends. (Mom grew up in a different county, but her friend had moved to my home county.) The two of them (Mom's friend and Mabel's son) acted as matchmakers and got Dad to start writing letters to Mom, and Mom wrote back. After a few years they met in person, and married.
I guess these examples just go to show that in a rural community where the same families have been settled for several generations, the word "family" can cover a lot of ground.