Qld electoral rolls:
1913 and 1919
Minnie Metherelle Johnston, home duties at Montague St, Cooparoo
Also in Montague St, Lily Johnston, h d; William Johnston, basket maker; Wilfred Kendall Ryan Johnston, hawker
Also in 1919
Gladys Vera Elsie Johnston, machinist address given as Montague St, Stone's Corner, Cooparoo
In 1925
Minnie, William, Gladys, and Wilfred all at Montague St (seems to be in Bulimba now) also
William John Johnston, milk vendor,
I cannot see any of them after 1925.
Cheers, Judith