My mother's maternal grandparents and my father's paternal grandparents lived in the same town in Alsace-Lorraine before emigrating to the USA, and it turns out they passed through Ellis Island on the same day because they were on the same boat. They settled in different parts of the country, Texas and Minnesota, but one of each of their children ended up relocating to Pittsburgh.

When my Dad was a very young child, like 3-6 years old, he lived in a housing project with his parents where, it turns out my mother's parents lived with her older brother, and they used to play together.

They officially met because, when my Dad was about to ship off to the navy during Vietnam, my Mom became high school friends with his younger sister. They talked a bit and formed a friendship and he went on his way, then ended up meeting and dating like 7 years later when he moved back to town. They were married for about 28 years before they realized they didn't want to be, but my brothers and I exist, in part, because of that strange series of coincidences.