The last child of Allan Burn and Joice Morgan was Elizabeth Lillian Maud Burn (1876 - 1921). Lily was only a young girl when her father and then her mother died. She married Frederick Philip Strickland in 1908. Their engagement notice appeared in the Australasian in 1907. At the time of her engagement Lily was working in Perth, Western Australia as a Superintendent of the Nurses College.
I have not found any children of this marriage. At some stage Lily and Fred moved back to be near her sisters, as her death notice suggests she lived in Melbourne.