Hi Dee
This is about the era in Nova Scotia research that starts to be quite tricky, doesn't it? I find your best bet is to slog through county probate and land records (deeds and crown petitions) to hope to find some nuggets that might illuminate some relationships.
I did a quick search and found the probate of the will of a Richard Dechman, farmer of Musquodoboit, who died June 1836 (based on the implied ages of his children, he probably died youngish). He helpfully named a number of family members in his will (please double check this list, I jotted this down quickly):
Wife Agnes
Eldest son James Dechman
second son William Cook Dechman
third son John Dechman
fourth son George Dechman
fifth son Wallace Dechman
sixth son Richard Dechman
daughters Leah?
Carmmel?
Grizell?
Jane
Susan
young unnamed infant girl
John Grant Dechman executor (Matthew Archibald declined?)
The estate papers including his will can be found here, images 501 to 515:
https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSRS-SNQV
I didn't have time to check to see if this fits well at all with your relatives, but thought it might give you a starting point.