Hi,
Well, if it's his DC, then his parents were William Hogg and Agnes (or possibly Helen) Robertson.
Everything on his DC seems to tie up except his wifes first name, so as JustJean suggested (and I completely agree), I think the wife and mothers name might be reversed. I'm sure I've seen a BC for a child to a William Hogg and Agnes Robertson, but can't seem to find it again.
thanks,
Alan