Mary Clarke was John and Temperance Clarke's fifth daughter, and William's closest sister in age. She was christend on September 29, 1844, and married Isaac Collins in about 1865. Isaac was from West Haddon, and he and Mary lived in West Haddon throughout their married lives. Isaac was a farmer and so fit in with the agricultural community.
Isaac and Mary had ten children, seven of whom grew to adulthood: Samuel, Mary, John, Thomas, Alice, Ruth, and Rebecca. Mary died in 1930 at the age of 86 after being a widow for 13 years.