Susanah Treat was born about 1651 in Hartford, Hartford, CT and died in 1677 in CT. She married William Clark, son of William Clark and Katherine Bunce, in 1668 in Wethersfield, Hartford, CT. He was born about 1649 in Hartford, Hartford, CT and died in 1712 in Wethersfield, Hartford, CT.

William Clark, son of William Clark and Susanah Treat, was born on January 29, 1673 in Wethersfield, Hartford, CT and died on April 8, 1708 in Glastonbury, Hartford, CT at the age of 35. He married Mary Day, daughter of John Day and Sarah Butler, on November 14, 1699 in Haddam, Middlesex, CT. She was born in 1682 in Hartford, Hartford, CT and died in 1717 in CT at the age of 35.

Peletiah Clark, son of William Clark and Mary Day, was born on March 5, 1714 in Haddam, Middlesex, CT and died in 1746 in CT at the age of 31. He married 2 times. The first time he married Anne Sutliff, daughter of Nathaniel Sutliff and Sarah Savage, on June 26, 1735 in Haddam, Middlesex, CT. She was born on May 30, 1715 in Durham, Middlesex, CT and died on March 16, 1739 in Haddam, Middlesex, CT at the age of 23. The second time he married Elizabeth Sleed on December 4, 1740 in Haddam, Middlesex, CT. She was born in 1702 and died in 1745 at the age of 43.