Barbara Winslow Grant, a former charity fund-raiser and leader in school volunteerism who was the wife of one New York Times publisher, the mother of another and the grandmother of a third, died on Saturday in Rancho Palos Verdes, Calif. She was 90.

Her death, at a retirement home, was confirmed by her son Arthur Ochs Sulzberger Jr., the chairman of The New York Times Company.

Mr. Sulzberger succeeded his father, Arthur Ochs Sulzberger, as publisher in 1992 and as chairman in 1997. The elder Mr. Sulzberger was married to Ms. Grant from 1948 until they divorced in 1956. He died in 2012. Mr. Sulzberger Jr.’s son, Arthur Gregg Sulzberger, was named publisher in 2017.

Ms. Grant was born on March 31, 1928, in Paris to Theodore F. Grant, an importer of animal hides, and the former Helen Fisher MacDonald, a secretary.