Are you sure they were twins?
Source: "Connecticut Births and Christenings, 1649-1906", database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:F7WN-1JY : 7 January 2020), Jerusha Griswold, 1799.
Connecticut Births
: Jerusha Griswold
: Birth 8 Feb 1799 Wethersfield, Hartford, Connecticut
: Father Josiah Griswold Mother: Abigail
Source: "Connecticut Marriages, 1630-1997", database, FamilySearch (
https://familysearch.org/ark:/61903/1:1:F7GT-HLJ : 11 January 2020), Jerusha Griswold in entry for Samuel McClallen, 1818.
Connecticut Marriages
: Samuel McClallen
: Marriage 29 Sep 1818 Hartford, Connecticut,
: Spouse Jerusha Griswold
Source: "Connecticut, Deaths, 1640-1955", database, FamilySearch (
https://www.familysearch.org/ark:/61903/1:1:F7XQ-TPT : 11 June 2020), Jerusha McClallen, 1824.
Connecticut, Deaths
: Jerusha McClallen
: Death 28 Oct 1824 Connecticut
: Death Place: Death Notice, Hartford Courant, Issue 23 Nov 1824
Burial location VA - seems very odd, but bio/dates on these FAG memorials matches?
Burial:
https://www.findagrave.com/memorial/154896408/jerusha-mcclellan
Spouse:
https://www.findagrave.com/memorial/154896714/samuel-mcclellan