Ligue de hockey senior du Québec
Born in Thetford Mines, Quebec, Fillion is a member of Thetford Mines' and one of Quebec's most famous hockey family, being one of seven hockey playing siblings. Right winger Marcel also reached the National Hockey League, playing one game for the Boston Bruins in 1944–1945 and playing in the Eastern Hockey League, the American Hockey League and the Quebec Senior Hockey League from 1944 to 1952. Right winger Dennis played in the United States Hockey League, the Pacific Coast Hockey League, the American Hockey League, the Maritime Major Hockey League, the Quebec Senior Hockey League and the Atlantic Coast Senior League from 1948 to 1956. Defenceman Georges was invited to the Montreal Canadiens training camp at the same time as Bob but decided to return home to Thetford Mines because he did not speak English very well. He played in the Quebec Senior Hockey League. Nelson, Fernand and Jean-Marie Fillion also played in the Quebec Senior Hockey League and various Senior Hockey leagues throughout the years. All seven Fillion brothers played on the same team, the Thetford Chappies of the Ligue Intermédiaire de Hockey du Québec during the 1940s. This was where Bob and Georges were spotted by a Canadiens scout.