I goofed up a couple of dates there- so here is the quick summary
So it appears William Sr b. 1795 was in Trafalgar by 1818 for marriage and maybe went back & forth to the states? and he rented land on lot 15 (3369 Sixth Line) where he built a log cabin for his growing family, that totalled 11 children born between 1819 & 1843.
In March 1822 he purchased lot 10 and farmed it. (no house or family was listed in assessment as living there and no acres were cleared)
In 1835 he purchased lot 15 (3369 Sixth Line) where he had been renting as the owner of the land D’Arcy Boulton of Family Compact fame had died.
In 1840 he and William Somerset then age 23 finished building a frame, under 2 storey home on lot 10 with 12 acres cleared(S. Rampens home)(William was married Nov 1839)
In 1845 he built an under 2 storey frame addition to his log cabin
Sometime before 1855 he added bricks to the frame structure.