Looking at the 1910 census the couple had 2 children - Wallace Bruce and Mabel M Bruce. Females are more difficult to trace ssine there is no central registry for marriages in the USA.
The SSDI shows Wallace
Wallace D. Bruce - Born: 29 Dec 1903 and Died: 2 Jul 1990
SSN was issued in California (Before 1951)
Wife:- Eva Bruce
Born 5 th August 1914 and died July 1982
Last Residence: 92011 Chula Vista, San Diego, California,
SSN issued: California (Before 1951)
Have you tried contacting the Chula Vista Public Library to see if they have an Obituary for Eva - there is a link below with a "contact us" button Sandra. If they cannot help perhaps they could point you in a better direction.
http://www.chulavistaca.gov/City_Services/Community_Services/Library/default.asp Sent pm with biography for the son of Mabel Bruce Parma.
1930 Census -
https://familysearch.org/pal:/MM9.1.1/XCDY-7Y8Sandra