Had no children
He has/had a relationship with Rosa (Rose).
I believe I've found his immigration record to Canada, in the online database of the National Archives of Canada:
Name: Chaim David Chwojnik
Arrived: April 10 1927
Port of arrival: Halifax, Nova Scotia
Ship: Regina, White Star Dominion
Age: 18, Single
Nationality: Pol
Naturalized: April 28 1933
Born: Rozany, Poland
Passage paid by: Self
Occupation: Student
Going to: Uncle K. Kronick, 565 Lisgar St., Ottawa, Ontario
Nearest relative in home country:
Abel Chwonak (?), Rozany, Grodno
grandparents
parents
brothers/sisters
children
The data shown has no sources.