Dorothy (Dorsey) C. Grandfield died peacefully on August 28. She was 96.

Born in Connecticut, she had been a resident of Brookline, for more than 30 years. She attended the Mooreland Hill School in New Britain, Conn. and Kenwood Academy in Albany, N.Y.

She graduated from Manhattanville College in 1943 with a degree in mathematics. During the 1940s she worked at Pratt & Whitney Aircraft Company in the engineering division.

Dorsey was a lifelong seasonal resident of the Vineyard. Her parents Doc and Dodie Coholan built a house, Summersalt, in Harthaven in 1929, which the family still owns.

She was a kind, optimistic person with many friends. She enjoyed playing bridge and tennis when she was younger and loved music — classical, modern, and everything in between. For many years she sang barbershop through Sweet Adelines International.

She is survived by her brother Mark Coholan of California; her daughter Dorsey Grandfield and sons Michael and Peter Grandfield, all of Brookline; her son Mark Grandfield and his wife Tova Ferro of New York; her granddaughters Katharine Grandfield and Ava Grandfield, her great-granddaughter Lillian Geary, and numerous nieces and nephews.

There will be a memorial and celebration of her life on Friday, Sept. 22 from noon to 3 p.m. at Lola’s in Oak Bluffs. Interment will take place on the Vineyard.

Donations in her name may be made to Cape Cod Healthcare, CCHC Foundation, P.O. Box 370, Hyannis, MA 02601, or the American Red Cross.