In The Lives of Christopher Chant, Francis lives with his father (his mother is not mentioned) in Wiltshire. They keep horses, and go ride to hounds. Francis, who is about Christopher's age, despises Christopher because he's a townee, because he's the product of what Francis' family consider to be a bad marriage, and because he can't do magic. Christopher considers Francis, not without justification, to be a smug prat.
In Charmed Life, we learn that Francis married his cousin Caroline Chant and had two children, Cat and Gwendolyn Chant, before he died in the Saucy Nancy disaster. He also had one final fight with Christopher.