From MA vital records:

William was born circa 1857 to William P. FOWLE and Susan M. RISING. William and Susan were married 21 Sep 1854 in Roxbury. The marriage was William's second and Susan's first.

William P. FOWLE Sr. was born in Boston to Parker FOWLE and Lucy Margaret HAYNES. He died 28 Feb 1872 in Boston, age 50y 5m 10d.
William Sr.'s father, Parker FOWLE died 24 Aug 1862 in Boston, age 73y 9m 7d. He was born in Woburn to John (born in Woburn) and Mary (born in Lexington).
William Sr.'s mother, Lucy Margaret HAYNES died in Boston 29 May 1883, age 90y 4d. She was born in Sudbury to Isaac and Rebecca (both born in Sudbury).

Susan M. RISING was born to Darius B. RISING. From the census, Darius was born circa 1810 in Vermont, he married Sophia ___ born circa 1807 in Connecticut, and Susan was born in Connecticut.
Susan's father, Darius B. RISING died 21 Aug 1878 in Boston, age 68y 4m 6d. He was born in Orange, Vermont to Julius and Susan C. (both born in Suffield).
Susan's mother, Sophia ROBERTS died 20 Jan 1869 in Boston, age 61y 10m 10d. She was born in East Hartford, Connecticut to Elisha? and Sarah (both born in East Hartford).

A Connecticut record says that Darius B. RISING and Sophia ROBERTS were married 31 Mar 1833 in East Hartford.

Barb