Olive W. Cobb, a past president of the Sulgrave Club and board member of Children’s National Medical Center, both in Washington, and the private Landon School in Bethesda and Madeira School in McLean, died Dec. 22 at her home in Naples, Fla. She was 86.

The cause was lung and heart disease, said her son Robert W. Cobb.

Mrs. Cobb held periodic jobs, including real estate sales work in the late 1970s with the Begg company in Washington. She was active in the Junior League of Washington; the Washington Antique Show, which she once co-chaired; and the National Society of the Colonial Dames of America.

Olive Latimer Watson, a native Washingtonian, was a 1944 graduate of the Madeira School and a 1948 cum laude graduate of Vassar College. Her father, Robert C. Watson, was U.S. commissioner of patents under President Dwight D. Eisenhower, and her maternal grandfather, Asbury Churchwell Latimer, was a Democratic congressman and senator from South Carolina.

She won many local and regional tennis tournaments, took up golf at 59, and made a hole in one at the Chevy Chase Club and the Gibson Island Club in Maryland, her family said.

She moved to Naples from Chevy Chase in 1991. She was a past secretary of the Chevy Chase Village board of governors.

Survivors include her husband of 58 years, Calvin H. Cobb Jr. of Naples; five children, Alice Parte of Saint-Germain-en-Laye, France, Joan Pettit and Olive Waxter, both of Baltimore, and Calvin H. Cobb III and Robert W. Cobb, both of Chevy Chase; 16 grandchildren; and one great-grandson.

— Adam Bernstein