Hi. I'm not related to this family.This couple you mentioned married in L'Acadie.Here is their marriage from the Quebec, Vital and Church Records (Drouin Collection), 1621-1967 :
Pierre Exure Dupont of St-Cyprien (Francois Dupont & Celeste Fornier of St-Cyprien) m. 14 Oct 1845L'Acadie (Ste-Marguerite-de-Blairfindie) Marcelline Brosseur (widow of Zephirin Lecuyer)
Here is Marcelline's 1st marriage:
Zephirin L'Ecuier (Isaac L'Ecuier & Olive Boutin of Blairfindie) m. 25 Jan 1842St-Jean-sur-Richelieu (St-Jean-l'Evangeliste) Marcelline Brosseau (Godfrey Brosseau & Josephte Berdard)
So, Damase (Domasa) & Marceline were from Marcelline's 1st marriage.Here is a baptism for Damase:
Damase L'Ecuyer, b. 31 Oct, bap 31 Oct 1842 St-Jean-sur-Richelieu (St-Jean-l'Evangeliste), son of Zephirien L'Ecuyer & Marceline Brosseau -godparents- Isaac L'Ecuyer & Josephte ?
I did not find a baptism for their daughter, Marceline, but I did find her marriage:
Noe Desorey (Simon Desory & Sophie Perrot) m. 26 Oct 1862 St-Hermenegilde (Badford) Marceline L'Ecuyer (Zephirin L'Ecuyer, deceased, & Marceline Brosseau)
This daughter, Marceline, was buried in that same parish in 1929:
Marceline Lecuyer, widow of Noe Desorey, d. 28 Nov, bur 30 Nov 1929 St-Hermenegilde (Badford), age 85.
Damase Lecuyer probably married Celanire Gendron. This couple had a son born in St-Hermenegilde - Joseph Damase Adrien L'Ecuyer, b. 17 May, bap 18 May 1877 St-Hermenegilde (Badford), and a daughter, Marie Celanire, born 2 years earlier, b. 27 Feb, bap 28 Feb 1875 St-Hermenegilde. In this case the godparents were Noe Desorey & Marceline L'Ecuyer.