1871 census Low Ottawa West Quebec
DAVIS
Joseph, 25, b Ontario,
Johanna, 30, b Ireland
Margret, 5,, PQ
Sarah, 1, PQ
1881 - same place, same people, but wife's name is Julia which is likely an enumerator's mistake.
1891 census - same place
Joseph 44, Johana, 50 and Margaret 25.
I did not find them on 1901 or1911 canadian census.