I have not been able to go as far as I would have wanted with the ancestry of Johnny. One reason being that the surname has so many variants: Rhault, Raoul, Rheault, Rault, Rau, Reau, Rho and Alexandre.
Searching with the most distant ancestor (Francois) : the use of his wife's name (Genevieve Richard) did not help. This is not a name that has variants or at least not that many.
I suspect that the Francois got married in New Brunswick.
Here is the ancestry have I have able to find. Read from bottom to top.
Francois Rheault dit (aka) Alexandre married Genevieve Richard at a date and place unknown at this time.
Hyacinthe (Alexis) Rheault dit Alelxlandre married Francois Grondi (d.o. Louis and madeleine Daviau) 8 Feb 1802, Les Beacquests
Damase married Beatrice lariviere (d.o. J.B. and Lucie Gagnon) 22 Aug 1854, Plessissville
Joseph Rheault maarried Delphine Bergeron (d.o. Olivier and Lucie Prince) 19 Jan 1880, St-Calixte (Megantic Co.)
Johnny Rheault married Rose-Emma Couture (D.o. Achille and Marie Audet, 26 Jun 1906, St-Léon-de-Standon
Marriage data for children of Johnny:
Jeannette M (for married) Alphonse Lemelin 9 Jun 1927, Lac-Frontiere
Ovila M Fernande mercier, 24 Apr 1935, Lac-Frontiere
Lionel M Jeannette cote 1929 (your data; I have not found anything on him)
Roseanna M Real Belanger 20 Sep 1928, Lac-Frontiere
Marie Jeanne M Rosaire Caron 9 Jul 1946, Cap-St-Ignace
Germaine M Liones-Gaston Catellier 25 Sep-1939, Lac-Frontiere.
I trust that this is the kind of info you had in mind.