Technically the county is Sullivan because in 1787 the coutny name was changed from Cheshire to Sullivan. This date precedes Elizabeth's birthdate.
David Alden Pettegrew
I believe that he did not follow the family to Iowa or Utah.
Thisi individual only appears in the 1850 census in Utah. There is no other information that indicates she is part of the family.
This is the only source that brings this individual into the family. I am not sure she is actually part of the immediate family but she is on the 1850 Utah Census.
Mary Eliza Shurtliff
The sources say that Rexburg is in Jefferson County but it is actually in Madison County, Idaho.
Lewis Warren Shurtliff
He was probably born in Sullivan, Portage, Ohio which is the same city as his sister Mary.
Lydia Amanda Shurtliff
The discrepency of his birth is that Winter Quarters was never in Caldwell County, Missouri. Since the Birth Date is prior to the settleing of Winter Quarters she was probably born in Far West, Caldwell, Missouri.
Benjamin C. Ellsworth
Performed marriages for: Benjamin Gibson & Asenath Jones, William K Parshall & Lucenia Miles, Lawson Atchison & Caroline Stanton, Jesse Mason & Eliza Ann Johnson, Haskill V Shurtliff & Elamine E Shirtliff, David Jenkins & Agness Magregor, William A. Weston & Cynthia Shirtliff, Oliver Forrester & Maria Atcheson in 1850 Pott. Co.
Alpheus C. Ellsworth
The source that labels him Albert, webtree.com, is wrong in name but all of the other information is directly correlated.
The real birth is inconclusive becasue there are only the two sources available and the two are about 16-17 years.