Found the source book for this family. Not sure it will help. Only one Elizabeth.
http://archive.org/stream/historyandgenea00corngoog#page/n10/mode/2up
The history and genealogy of the Cornish families in America (1907)
4th Generation p. 16
(17) Sergt. ELISHA CORNISH b. June 6, 1722; d. April 27, 1794;
m. 1st Hepsibah (dau. Charles) HUMPHREY, Sept. 25, 1740 (she b. , 1724; d. Feb. 25, 1756);
m. 2d Mary (dau. Benjamin) DYER, Aug. 31, 1756 (she b. ; d. Oct. 21, 1775); m. 3d Charity (dau. John PETTIBONE and widow of Sylvanus) Humphrey, June 2,
1776. She b. June 30, 1744; d. Oct. 6, 1803. She m. June 14, 1799, Dr. Amasa Case.
He was a farmer, and one of the leading citizens of Simsbury, Conn., where he resided.
Children (by 1st wife) :
60 Hepsibah, b. Aug. 27, 1741; d. Dec. 17, 1741.
61 Hepsibah, 6. Nov. 4, 1742; d. , 1800; m. Theophilus Humphrey, 1761. He 5. 1744; d. 1826.
62 JAMES, 6. Dec. 16, 1744.
63 Elzabeth, b. May 8, 1746; d. Oct. 22, 1840; m. Elijah Wilcox, of Simsbury.
64 ELISHA, 6. Dec. 7, 1748.
There are more generations with bmd!