My husband's cousin was my mother's room-mate in College. In fact, My dad dated the room-mate first.
My husband's sister was the best friend of my dad's cousin's daughter.
My Father in law rented farmland from my dad's cousin.
In the '80's, My inlaws owned a house across the street from the park my mother played in, in the '30's.
But my husband and I never met until he was thirty, and not through any family connection: we didn't know any of this until several years after we married.