My paternal grandmother, Mary Head Poole died in 1944. I was born in 1942 so I don't actually remember her, but photos show that we did indeed meet. For a long time, I knew nothing very little about her. Thanks to US Census records, I learned about her life after marrying my grandfather in 1896, but I still knew nothing about her parents.
Then, while collecting information about my grandfather, I examined the 1892 New York State Census. It one told me that William Poole, my grandfather, was then living in Brooklyn at 73 Schenectady Avenue. On the same page, immediately above William's entry, is a listing for the family of Charles Head, living in the same tenement! He was listed as a 60 year-old painter from England. His wife Elizabeth is the same age and was born in Ireland. They had two daughters aged 25 and 16. Oddly, both daughters are listed with the same name, “Minnie” - a common nickname for Mary. It appears that that William and one of the two neighbor girls fell in love. They married a few years later.