EDWARDS, Joseph & Flora aft 1881 Nova Scotia

EDWARDS, Joseph & McDOUGALL, Flora were born in Little Bras D'Or, Cape Breton Island, Nova Scotia abt 1856. They were married in North Sydney, Cape Breton, Nova Scotia 1870, first daughter Mary Ann was born in 1871, second daughter Margaret Jane was born in 1873, third daughter Florence was born in 1875, first son Joseph Francis was born 1878 second son Alexander was born 1881. Alexander (Alec) was my paternal greatgrandfather, he was born after the census of 1881. The 1881 census is the last record I can find for Alec's parents. In the 1891 census, Alec was living with Joseph MacDONALD and Lucy (nee KENNEDY) MacDONALD and his brother Joseph was living with Susan & Catherine KENNEDY (sisters of Lucy). I would like to know what happened to Joseph & Flora.

Al Parsons
Duncan, British Columbia, Canada