I have some information for you, but I do not know how much more can be given here, due to privacy concerns of those still living.
Your Uncle Marcel was born 1949. Your Uncle Vital was born in 1951, and married. Like your father, it looks like they were born in Caraquet, New Brunswick also. I have nothing on your Uncle Raymond (so far).
Your great-grandparents (on Antoine Lanteigne's side) are Cerenus Lanteigne and Cecile Brideau. They resided in the Tracadie, New Brunswick area.
Your great-grandparents on Elia Chiasson's side:
Her father, Jean-Louis Chiasson (1884-1963). His parents (a set of your great-great grandparents) were Joseph Chiasson (died 1940) and his wife Marie Anne "Rosaline" Theriault (1844-1904). They had 8 children that I know of. This side of your family is easy to trace back even further.
Jean-Louis Chiasson married to Philomene Hache in 1926; daughter of Antoine Hache and Henriette Landry (another set of great-great grandparents for you). I do not have much more on this particular family line.
Your grandmother Elia had two sisters that I know of, and they had at least one child each (who would be first cousins to your father).