In the 1949 Voters' List, Muriel is listed at the same address. In the 1945 list, there is an Allan MacDonald, a baker, listed at 470 Adelaide Street, London. No one else is listed as a registered voter in the household.
The death record for the baby shows the address of the father, Allan, at 313 Hyman Street, London. Says the father was born in North Oxford and the mother, Muriel Douglas, was born in St. Paul, Minnesota, so wonder if Allan went to the US at some point and remarried.
I did find this marriage in New York:
Name: George A M Mcdonald Titles and Terms: Event Type: Marriage Event Date: 12 Oct 1914 Event Place: , New York, United States Age: 30 Marital Status: Previous Husband's Name: Race: Birthplace: Birth Year (Estimated): 1884 Father's Name: Allen Mcdonald Father's Titles and Terms: Mother's Name: Ann Cameron Mother's Titles and Terms: Additional Relatives: Spouse's Name: Muriel S Douglas Spouse's Titles and Terms: Spouse's Age: 23 Spouse's Marital Status: Spouse's Race: Spouse's Birthplace: Spouse's Birth Year (Estimated): 1891 Spouse's Father's Name: Robert H Douglas Spouse's Father's Titles and Terms: Spouse's Mother's Name: Mary E Smith
This is him because when you look at the original image, it says he was born in Thamesford, Ontario, and living in London, Ontario. His second marriage. Says he is divorced as of December 16, 1909 in Cuyahoga County, Ohio (Cleveland). Working as a civil servant. Marriage actually took place in Niagara Falls, New York.Muriel was born in St. Paul's, Minnesota, but was living in London, Ontario at the time of the marriage. First marriage for her.
George and Iva were married on 26 April 1905 in London:
Name: George Allan Macdonald Birth Place: Thamesford, Ontario Age: 21 Estimated Birth Year: abt 1884 Father Name: Allan Macdonald Mother Name: Annie Cameron Spouse Name: Iva Laviniaor Warren Spouse's Age: 21 Spouse Birth Year: abt 1884 Spouse Birth Place: Mt. Vernon Ohio Spouse Father Name: Chas W Warren Spouse Mother Name: Willella Willoughby Warren Marriage Date: 26 Apr 1905 Marriage County or District: Middlesex
Iva was living in Cleveland at the time of the marriage, so they must have moved there after the marriage and were divorced there.