Marie Lucienne Cécile BACHAND born & bapt. 11 Feb 1924, daughter of Napoléon & Rose Anne BÉLANGER, was later married in Calgary, 22 Mar 1943, and stated her parents to be Napoléon & Rose Anne Bélanger. Not a single mention of "adoptive" parents.
As she was a minor at the time of her marriage in Calgary, while her parents were still living and residing in Montreal, Qc, maybe she needed someone's approval in order to get married.