Uncle Ronald by Brian Doyle

From chapters.ca:
Humor and tragedy merge in this story of a family, and a culture, in crisis. At 112, Mickey McGuire is Canada's oldest citizen, but he remembers with perfect clarity the events beginning in Ottawa in 1895. That year, without investigating the cause of his daily fainting spells, school authorities decide that 12-year-old Mickey should stay home. But home is a problematic place, the site of frequent beatings of Mickey and his mother by his violent, alcoholic father. Determined to spare her son further trauma, Mickey's mother sends him to stay on her family's farm run by her brother and twin sisters. Strong and tender, Uncle Ronald is wise in the ways of horses, geese, and men.