Mary Tinley Daly, 75, who wrote a weekly column about family life that appeared in The Catholic Standard here and in other Catholic newspapers in the United States and Canada for many years, died of cancer Tuesday at the home of a daughter in Washington.

Mrs. Daly also wrote articles that appeared in Parents' Magazine, Coronet and Baby Talk. A booklet she wrote, "Parents as Teachers of Religion," was published by the International Center for Studies of Religion in Brussels.

Her column, "At Our House," was an account of the doings in the Daly household. In addition to Mrs. Daly, it included her husbans, John Jay Daly, a newspaperman and free-lance writer, and their seven children.

"At Our House" was syndicated by the old National Catholic News Service, now the NC News Service, from 1947 to 1968 under Mrs. Daly's byline. One of her daughters, Mary Daly Gorman, continued the column for another seven years.

From 1951 until her retirement in 1966, Mrs. Daly was director of public relations at Catholic University. For several of those years she also did public relations work for Trinity College and Georgetown Visitation Preparatory School in Washington.

Mrs. Daly was born in Council Bluffs, Iowa. She came to Washington in 1920 and attended Trinity College, from which she graduated in 1924. She worked for the news service of the National Catholic Welfare Conference. She and her husband were married in September 1926. He died in 1976.

Mrs. Daly was a former member of the boards of the Christ Child Society and of St. Ann's Infant Home. She was a member of the parish of The Shrine of the Most Blessed Sacrament in Chevy Chase. She also was a member of the American Newspaper Women's Club.

Survivors include four daughters, Margaret McKaig, at whose home Mrs. Daly died, Virginia Daly, also of Washington, Eileen Brennan, of Bethesda, and Mary Gorman, of Chevy Chase; a son, John Jay, of Chevy Chase; a brother, Hubert L. Tinley, of Omaha, and 20 grandchildren.

The family suggests that expressions of sympathy be in the form of contributions in Mrs. Daly's name to the Trinity College Development Fund, Michigan Avenue and Franklin Street NE, Washington, 20017.