I believe this is the family from all you note.
1949 Voters' List in Electoral District of Verdun - Lascalle. City of Verdun. Urban Polling Division.
Address: 63 Quatrieme Avenue.
Burnett, John, Plumber
Burnett, Mrs. Catherine
Burnett, John, Jnr, Machinist
Burnett, James, Draughtsman
Also, re Katherine's Death:
Died 24 Dec 1969
Obituary 26 Dec 1969
Burial 27 Dec 1969
Spouse: John.
Children: John, James, Hugh
There is also a newspaper Obituary for Katherine I cannot access, however.