According to the CDI for their son Joseph Alex Grant, her maiden name is Sparn.Could be a mistake, but I found this..........
1900: Philadelphia Ward 21, Philadelphia, Pennsylvania
Joseph M. Sparn (head) 27/Jul 1872 PA>GER>GER Fruit Dealer Married 10 Years Margretta M. Sparn (wife) 31/Nov 1868 PA>PA>PA 4 Children, 3 Living Laura E. Sparn (daughter) 8/Jan 1892 PA>PA>PA Pearl S. Sparn (daughter) 3/May 1897 PA>PA>PA Joseph T. Sparn (son) Zero/Dec 1899 PA>PA>PA +1 Boarder & 1 Servant.
In 1910 Joseph is widowed & boarding in Philadelphia with son Joseph "Jr".I don't know what happened to Pearl.
Their child, Mary, death:
Margaret burial: (Son Joseph T. is also buried there)
Name: Joseph N. Sparn Birth Date: abt 1873 Event Type: Burial Burial Date: 13 Oct 1919 Burial Place: Merion, Montgomery, Pennsylvania Organization Name: Westminster Cemetery Company Nearest Relative or Friend: Joseph Sparn
Philadelphia, Pennsylvania, Marriage Index:
Name: Joseph Nicholas Sparn Gender: Male Spouse Surname: Holiday Spouse Gender: Female Marriage Place: Philadelphia, Pennsylvania, United States Marriage Year: 1893 Marriage License Number: 61902 Digital GSU Number: 4141925
Name: Margaret Holiday Gender: Female Spouse Surname: Sparn Spouse Gender: Male Marriage Place: Philadelphia, Pennsylvania, United States Marriage Year: 1893 Marriage License Number: 61902 Digital GSU Number: 4140435
William, E. Laura & Norman D. Grant are in Los Angeles in 1940.