Rowland was the son of Wymond & Mariah (Cotton) Bradbury
He married first Mary Greenleaf, daughter of Edmund & Abigail (Somerby) Greenleaf, on 15 Nov 1723 - parents of Jabez
After the death of wife Mary he married Elizabeth Oliver - parents of Oliver, Mary, Ann, Abigail, Maria, Elizabeth, Jerusha, Wymond/Wyman & Rowland II (all of the children were born at Falmouth, Cumberland, ME)
It may be possible to confirm family relationships with Rowland by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Rowland: