Hello Kevin,
This would seem to mean that John Thomas Connolly Thompson was an unmarried (single) man living at the time in a de facto relationship, or did Linda return to Estonia to have her child (Harald)? And did he remain in Canada or go with her? The Geni profile doesn't appear to show any other children for John.
I also have Harald's Geni profile and am trying to find out what he did for a living, most probably in Estonia.
There are some fascinating links in this Thompson family line.
Best wishes, Harry Thompson