father William McDonald & mother Ellen Toohey
The only marriage I could find is in Qld in 1883 for an Ellen Toohey and a William MacDonnell on 19 Sept 1883, They had 2 children Matthew MacDonnell B 29 October 1884 in Queensland and Ester Angelina McDonnell B 10 April 1887 in Queensland. Esters b surname is spelt "McDonnell'' as is her fathers.
I've heard of children's names being changed if they were in institutions. I've also come across only younger children being placed in institutions if they are unable to be cared for, as the older ones were expected to and did care for themselves.......