Jo Canavaro is a rugby legend, his father was a rugby legend, and his grandfather was a rugby legend. To his great shame, his 13-year-old son, Tom, is as bad on the field as he is excellent at maths.

Jo Canavaro is a rugby legend, his father was a rugby legend, and his grandfather was a rugby legend. To his great shame, his 13-year-old son, Tom, is as bad on the field as he is excellent at maths.