Try canada411.ca

There are some Kydds listed in Iroquois Falls. May be relations.

He seemed to have stayed in the same area -Nellie Lake/Porquis Junction/Iroquois Falls

This is before 1921 but likely his sister's death in Parry Sound.
Sarah Beatrice Kidd, died 24 June 1919, b Maple Lake, living Deer Lake, died of meningitis/sunstroke, aged 14,d/o William Ryckyard Kidd & Emily Ann Smith, informant: William R Kydd of Deer Lake. Registration # 025374.
Parry Sound District

It doesn't look like any of the children of Wm and Emily were registered at birth.