Who is The Modys from Swimming Lessons and what is their importance?

Mentioned in most of the stories, but extensively described in "The Collectors," Dr. Burjor Mody is a veterinarian who moves into Frizsha Baag Block C, third floor when transferred from Mysore to become principal of the Bombay Veterinary College. Dr. Mody instantly becomes the pride of the building, just as his big-boned son, Pesi, becomes leader of the rowdy elements in the 10-16-year age group. His chief talents are brute strength, hawking enormous amounts of phlegm, and breaking wind with both pungency and tonality. This earns him the sobriquet "paadmaroo," which he wears proudly. Eventually, Pesi's behavior gets him sent off to boarding school, where he is left back several times.