When Mary Brooks was born on 2 June 1795, her father, Robert George Brooks, was 34 and her mother, Polly Mary Grass, was 27. She married Jacob Greever on 5 May 1817, in Augusta, Virginia, United States. They were the parents of at least 5 sons and 4 daughters. She lived in Dolson Township, Clark, Illinois, United States in 1860. She died in 1861, in Edgar, Illinois, United States, at the age of 66.