Cephas and Olive's daughter Florantha married missionary Granville Sproat and, after spending time teaching at La Pointe, Wisconsin, moved to California during the gold rush.

Florantha and Granville's daughter Elvira (Cephas Thompson's granddaughter) married James Mason Hutchings, an early promoter of Yosemite National Park.

Between 1805 and 1821, Thompson also paid five extended visits to Bristol, Rhode Island, where he painted over 132 portraits of merchants, ship-owners, sea captains, and their wives and children.

As Deborah Sisum has noted and Keith Arbour has extensively documented, the most important patrons of Thompson's early career were members of the DeWolf family of Bristol, Rhode Island.

For additional details see James Blachowicz, From Slate to Marble: Gravestone Carving Traditions in Eastern Massachusetts, 1770–1870 (Graver Press, 2006), pp.