There were two people in Toronto named Harry Sonshine; I am not sure whether they are related.
One of them died on 17-Oct-1970. He was Greta's husband, father of Bonnie, Enid and Jay, brother of June Bussin and Helen Tugg.
The other died on 8-Feb-1973. He was the father of David and Reginald, brother of Joseph, Betty Rosen, and Selma Walfish.
The Harry Sonshine who died in 1973 had been general manager (and maybe owner) of the Toronto Argonauts. There's a long article about him from 1955 here: https://archive.macleans.ca/article/1955/7/9/the-fan-who-took-over-...
An article in the Globe and Mail about Edward Sonshine (https://www.theglobeandmail.com/report-on-business/riocans-edward-s...) mentions that his family, original name Zonenszajn, changed it to Sonshine because there was another family in Canada by the name Sunshine. But that seems confused, because as far as I can tell, both families use the spelling Sonshine.