Thanks for looking up and submitting the William Johnston information.
Doesn't look like a match for me. I guess I'll have to try the census reports for Grey County. In digging thru the family notes this William that I am looking for spent time in King Twp, York County before moving to Grey County. I believe he was a joiner (carpenter) because his brother David joined him in King Twp and may have worked with him.
Sorry I have no information on Hendry/Forbes at this time. If my ongoing search comes up with anything I will send it along.