The indictment of Charles Theall and others partially reads:
In Committee of the Convention of the State of New York appointed for enquiring into, detecting & defeating all Conspiracies which may be formed in the said State against the Liberties of America. Fishkill Oct. 20, 1776.
WHEREAS this Committee did on the 17th Inst. resolve that the following Persons, Inhabitants of South East and Frederick Precincts in the County of Dutchess, should forthwith be disarm'd apprehended and secured, to witt, Uriah Townsend, Ebenezer Rider, Charles Cullen, Barne Hatfield, Uriah Wright, Joseph Hitchcock, Eli Crosby, Dr. Daniel Bull, Charles Theal, and Gilbert Dickeson, Daniel Babbitt, Daniel Brundage, Jeremiah Birch, junior, Moses Fowler, David Nash, Samuel Jowner, William Merritt, Thomas Carl.
This was at:http://www.babbitts.info/rpbgenealogy/daniel_babbit.htm
This places Charles as a resident of Fishkill prior to the onset of the Revolution. The Thealls', however, came from Stamford, CT by way of Westchester Co. Several of the persons mentioned in the indictment have similar origins. Uriah Wright is likely connected to the Wright's of North Castle, Westchester Co., NY; Moses Fowler also, William Merritt likely from Rye, Westchester Co., also Daniel Brundage (or from North Castle.) Gilbert 'Dickeson' may well be from Westchester Co. as well. The Fowler's, in particular, are related to the Theall's in Rye. Millicent, at one point, is described as 'from Rye', presumably born there; but it is not clear on what basis this conclusion is made. A daughter, Mary (Theall) Hamm is also given as b. Rye 1773 (although the above indictment suggests another possibility as a birth-place.)
Gilbert Dickinson, very likely a relative, seems to be of interest. In 1763, freeholders listed in Westchester Co. included:
Zabulon Dickenson, weaver
Robert Dickenson, yeoman
Charles Theal, yeoman
Abraham Theal, yeoman
Joseph Theal, yeoman
One can see how a birth-place of Rye might be assumed for someone connected with the Theall family of the time, but that the Dickinson's appear to be in North Castle.
is an early discussion of the Dickinson family in NB, with an indication of some of the problems. Note that Gilbert Dickinson, from Dutchess Co., is listed as a Loyalist; presumably the same from Fishkill. Also, from a 1777 tax list if Fredericksburg Precinct (presumably in Fishkill) are mentioned "John Dickenson, Gilbert Dickenson estate, Samuel Dickenson, Nathaniel Dickerson's widow, Tertullus Dickenson, James Dickenson Junior", some of whom seem there as early as 1767. Tertullus Dickinson, who seems to be Millicent's brother, was road supervisor for South Precinct in 1770-1, and tax assesor 1767-9. Prominent amongst this appears to be James Dickinson, Sr., who seems to be the father of several, grown sons. "Amos Dickinson, resident in Philipse Patent, Dutchess County, was son of James Dickinson." Amos is generally believed to have been a brother to Tertullus and Millicent Dickinson, and apparently was also father of James, Jr. In other words, it seems feasible to believe that James Dickinson, Sr. was the father of most, if not all, adult Dickinson's in the Fishkill, Dutchess Co., NY area in the early 1700's. This would include Charles Theall's wife, as they appear to have been residents of Fishkill at the time. It is stated that Samuel Dickinson was established as a brother of Tertullus Dickinson, furthering the concept.
James Dickinson, Sr. appears to be the James, Jr. in Hale's summary:
"1. James Dickinson, Jr., married Sarah Underhill, born about 1713, daughter of Abraham and Sarah (Townsend) Underhill. In 1748 James Dickinson Jr. and wife Sarah of South Precinct, Dutchess County, "late of Oyster Bay," sold a double house, owned by Abraham Underhill, to Jacob Townsend and William Butler."
This would be about the time of Millicent's birth. Charles Theall was said to have been b. ca. 1735, at least one child appears b. 1765, so Millicent was likely b. ca. 1740, very roughly.
Much of the above is guesswork, and there are many variations. One of this is incluided in the last quote. The Townsend's and Underhill's were definitely from Long Island, and it is hinted that the Dickinson's were as well. This may well be, and the choices for Millicent's birth-places (assuming she was a daughter of James and Sarah (Underhill) Dickinson are Oyster Bay, Long Island or Fishkill, Westchester Co.; excluding North Castle, Westchester Co. Tertullus Dickinson is given as b. Oyster Bay ca. 1733-9, and d. North Salem Westchester Co. 1801, and to have been a s/o James of Fredericksburgh, Dutchess Co. This seems a reasonable guess; and I would apply similar conclusions to Millicent. So, she seems most likely to be the d/o James and Sarah (Underhill) Dickinson, and to have been born either Oyster Bay or Fredericksburg Precinct, Fishkill, Dutchess (now, I believe, Putnam) Co., NY. A fine tuning of dates might resolve the birth place.