This note is written in response to your research on the Brangan family.
My father, John J. Brangan, was one of two children ( along with his sister, Celestine) who I believe was born to John J. Brangan, the jeweler, who resided in the Tarrytowns. He was born in Nov. 1916 and deceased December 26, 1959. He married my mother, Lucille Cancro, a Tarrytown resident, and I was one of two children along with my sister Mary Beth.
After his death, our family remained in Tarrytown and my mother passed away in July 1997. They are both buried in the Sleepy Holow Cemetery ( Sleepy Hollow, NY fka North Tarrytown, NY ) along with other Brangan family members. I currently reside in Poughkeepsie, NY with my wife and two daughters.
I hope this information is helpful and I will try to supply more. As an aside, my mother told me that there were several Brangan relatives in Long Island but we were never fortunate enough to meet them. Take care.