I wasn't sure you were interested in the later years, so I have rechecked.
In 1891 Mrs Mary A is at the same address
In 1891 Christopher's name is spelt Penin
gton
In 1892, Mary Ann is still in Forsyth St and Christopher's name is back to the original spelling

Checking the alternate spelling
1879 finds Mrs Mary A Penin
gton on the index, but in the book
Mrs Mary A Peninton dealer, Glebe St Glebe
In 1870 Reuben Penin
gton - Glebe St Glebe
Trish