Montrealer Philippe Masson was born on October 4, 1911, in Terrebonne, Quebec, the son of Joseph Masson, Seigneur of Terrebonne, now a vibrant community northeast of Montreal. Little is known about the life of Philippe Masson apart from the fact that he suffered from a chronic illness and died at the age of 32 on August 1, 1944. His remains are buried in the Parish church in Terrebonne. Despite his illness, he developed an interest in the collecting of ephemera. He developed a passion for the collection of bookplates, which he pursued in a single-minded fashion. In addition, he methodically catalogued and described his collection in fifteen volumes.

Louis Rodrigue Masson (baptized Louis-François-Roderick) was born in 1833 in Terrebonne, Lower Canada, and died in November 1903, in Montreal. He was the son of Joseph Masson and Marie-Geneviève-Sophie Raymond and had two brothers named Wilfrid and Isidore-Édouard-Candide. In 1856, Masson married Louise-Rachel McKenzie, the daughter of Marie-Louise Trottier Desrivières and Lieutenant-Colonel Alexander McKenzie of Terrebonne. They had ten children, five of whom reached adulthood. In 1883, Masson married Cecile Burroughs, the daughter of Léda Larue and John Henry Ross Burroughs, who was a prothonotary at the Superior Court of Quebec. They had three children. Masson became head of the Masson clan and administrator of its assets, including the property, the seigneurial mill, and the various enterprises bequeathed to him by his father. Although the seigneurial regime was abolished in 1854, the Masson family remained identified as a seigneurial family. In the unrest that followed when Rupert’s Land was acquired by Canada in 1869, Masson opposed his colleagues in the name of the rights of the Métis and First Nations. In 1871, he defended the Catholics that demanded that the federal government disallow the provincial law.

Joseph Masson was a Montreal businessman, banker, and politician. Masson was born in Saint-Eustache, Quebec, on 5 January 1791, to Antoine Masson and Suzanne Pfeiffer. After attending school, he started working as a clerk in 1807 for Duncan McGillis, a British merchant working in Saint-Benoît (now Mirabel, Quebec). Masson moved to Montreal and in 1812 was hired by Hugh Robertson, owner of Hugh Robertson and Company of Glasgow. In 1815, after working for Robertson for a few years, Masson negotiated himself a senior partnership and the firm's Montreal-based company became Robertson, Masson and Company. By 1819, Masson had a 50% share of the Montreal firm. He also purchased several vessels to better control and reduce costs associated with shipping. Masson was involed in efforts to build and improve canals and railways, including the Champlain and St Lawrence Railroad, Canada's first public railway. In addition to his success in business, Masson also began to pursue banking, buying shares in the Banque de Montréal in 1824, and joining their board of directors in 1826. He was also involved in politics, serving as a member of the Legislative Council of Lower Canada between 1834 and 1838, Montreal militia captain in 1823, and justice of the peace in 1836. In 1832, Masson purchased the seigneurie of Terrebonne. Masson married Marie-Geneviève-Sophie Raymond on 6 April 1818 in La Prairie. They had 12 children together. Masson died in Terrebonne on 15 May 1847.

Georges Marie Charles Masson was born Dieulouard, France in 1911 and spent his childhood near Nancy, France. Masson completed a veterinary degree and served with the French cavalry, before relocating to Montreal, Canada in 1935. At the age of twenty-four, he began teaching biology at Ecole Vétérinaire d'Oka, Agricultural Institute of Oka from 1935-38 (which later became Laval University Faculty of Agriculture). He continued his studies and received a License in Science from l'Université de Montréal in 1937. While attending a conference, Masson met McGill University lecturer Dr. Hans Selye and later began lab work for Selye. Inspired by Selye's endocrinology research, Masson pursued a PhD in experimental medicine. Upon graduation in 1942, Masson continued to work as a researcher at McGill's Department of Histology until accepting a job in 1948 at the Cleveland Clinic Foundation in Cleveland, Ohio, where he furthered his research on renal hypertension and cardiovascular disease.

Georges Masson met his wife, Helen Louise Masson, in 1937 while crossing the Atlantic on the famed liner Normandie en route to visiting family in France. They married a year later and had two children, Richard and Paul. Upon retirement in 1973, Masson and his wife relocated to Niagara-on-the-Lake, Ontario where he lived for the remainder of his life, a dedicated gardener and writer. To mark his gratitude to McGill, Georges established the Georges, Paul, and Robert Masson Scholarship Fund in 2002, awarded each year to science students at McGill University. In 2011, Georges Masson died of natural causes, aged 99

Cecelia Marie Helene Cecile Masson Globensky, neé Burroughs, was born on September 15, 1859, in Quebec City, Quebec, daughter of John Henry Ross Burroughs (1824-1904), a chief clerk of the Quebec Superior Court, and Léda Marie LaRue (1824–1902).

In 1883, she married Louis-Rodrigue Masson (1833-1903), a Canadian lawyer, militia officer, a Member of Parliament for Terrebonne, Quebec, and the fifth Lieutenant Governor of Quebec. They had three children. In 1911, she remarried Léon Alphonse Globensky (1840–1913), a real estate broker for Globensky and Hill Jones Ltée, Montreal, and a founder of Montreal's first French-language weekly newspaper, Les Nouvelles (1894).

She died on December 1, 1943, in Ottawa, Ontario, and is buried in Terrebonne, Quebec.