May be I can help, but I am not totally sure what you are looking after. I did a lot research in the parish records of St-Francois-Xavier-du-Sault-St-Louis. I am a direct descendant of Jarvis' Macomber on my mother side. More precisely from Charlotte Tsiononra Arakwente (Jarvis 1st wife) and closely related to Marie Louise Giasson who was my 3th gr.father'sister. Charles-Gedeon Giasson (my 3th gr.father) married Agathe Macomber one of Charlotte Tsiononra'daughter.