Not found Gertrude yet but the Joseph Mahoney in reply 8 is not the one who married Gertrude.
Joseph Harold Mahoney was born 15 th November 1910 to James J Mahoney and Margaret Matthews.https://familysearch.org/pal:/MM9.1.1/FXJL-X8R
Joseph Mahoney - Born 15 th November 1910 and died October 1986
Last Residence: 01960 Peabody, Essex, Massachusetts.
SSN issued: Massachusetts (Before 1951)
Certificate :- 049542