Margaret Schwarzenbach Beall, 105, a member of one of Maryland's most prominent Republican families, whose husband and son served in the U.S. Senate, died of heart disease July 25 at an assisted living home in Cumberland, Md.

A native of Cumberland, Mrs. Beall was married in 1926 to J. Glenn Beall, a real estate and insurance broker who served 10 years in the U.S. House of Representatives before being elected to the first of two Senate terms in 1952. He died in 1971.

While her husband was in Congress, Mrs. Beall spent much of her time in Washington, where she took part in activities of the Senate Wives Club. She knew every first lady from Eleanor Roosevelt to Hillary Rodham Clinton.

She divided her time between Washington and Frostburg, Md., until 15 years ago, and was the oldest living member of the Cumberland Civic Club.

She also was a member of the Garden Club of Frostburg, the Frostburg Homemakers Club and the Maryland Federation of Republican Women.

Mrs. Beall's husband lost his Senate seat to Democrat Joseph Tydings in 1964, but the couple's son, J. Glenn Beall Jr., defeated Tydings six years later to reclaim the seat.

He lost his reelection bid in 1976.

In addition to that son, survivors include two other sons, Richard O. Beall of Stevenson, Md., and George Beall of Lutherville, Md.; four granddaughters; and two great-grandsons.