Hi Susan,
I don't know anything about that line of the Dea family. My grandfather was Thomas Patterson Dea, born June 15 1891 in Andover MA. He died on October 2, 1953 in Andover. He had 4 sons.
i. Thomas Patterson born Sept. 12, 1922
ii. Allen Pearson born March 31, 1925.
iii. Robert Look born July 10 1930. (My father).
iv. Roger Philip born also July 10 1930.
All were born in Andover, MA.

Thomas Patterson Dea was the son of Edward John Dea. Edward was born abt 1853 in England and died about 1901 in Jamaica Plains MA. He was married to Christine Baxter who was born in 1860 in Glasgow Scotland. Edward John had seven children, all born in MA.

Edward John Dea was the son of Roger Dea, born abt. 1819 in New York. (The facts of this time period are sketchy to me. I have tried to pin them down but have had great difficulty in doing so.) My notes say that Roger Dea had 10 children from two wives. Some of these children did live in New York but I know not where. It is possible you are decended from one of these Deas. Apparently around 1870 the family moved from England to the US and lived briefly in New Jersey. Some later moved to New York while others went up to MA.
The children of Roger Dea and his first wife, Mary are:
i.Elizabeth born 1848 in England.
ii. Mary Lester born abt. 1850 in England
iii. Edward John born about 1853 in England.
iv. Harry born 1866 and died on March 13, 1883 in New Jersey.
Roger then married Jane Massden. Thier children are:
i. William born March 21, 1867 in England.
ii. Carrie born 1868 in England.
iii. Herbert born 1869 in England
iv. Annie born 1870 in New York.
v. Burt born 1872 in New York
vi. Jennie born 1881 in New Jersey.
Back in 1995 I hired a genealogist in New Jersey to do a records search for me in Salem and Cumberland counties. There was no listing for a Jennie or Barry Dea or any female Dea.
This is pretty much what I know. Sketchy rumors at best. Someday I hope to get a better picture of the facts, I'm just too busy right now to seriously look into it.

Good Luck in your search. Contact me again if you find anything on these names.
-Douglas Dea