Grace B. Cundiff, 81, who had been a member of the Friendship Baptist Church in Washington for more than 50 years, died Friday at the home of a granddaughter in Arlington. She had cancer.

Mrs. Cundiff had sung in the church's choir for more than 45 years and was a member of both the Women's and Sunshine clubs. Over the years she had volunteered her time at the church as a nurse and helped direct church dinners. She also had directed church plays to aid church fund-raising drives.

Before World War II, she worked for a time at the old Medical Museum in Washington. During the war she worked at a defense plant.

For more than 50 years she had worked as a baby sitter.

Mrs. Cundiff was a native of King George County, Va., and came to Washington at an early age and lived here until her death.

She was the widow of Herbert J. Cundiff, a retired employe of the National Institutes of Health, who died in 1959.

Mrs. Cundiff's survivors include two daughters, Ruth H. Johnson and Dorothy L. Crank both of Washington; 11 grandchildren, 59 great-grandchildren; 21 great-great-grandchildren, and three great-great-great-grandchildren.