I did a quick search but couldn't locate a birth reg. for a Henry Martin Doyle born in Victoria 1836-1888.
Do you know whether James and Margaret were married before they emigrated, or here in Australia?
Not sure that I'm on the right track at all, but found a marriage for a
James Doyle to Margaret Isabella Fields (or Field), St Francis Church Melbourne, 1848.
Elitha Charles: b.1851,Melbourne
Elisha Charlotte: b.1851,Melbourne
Aden Lewis: b.1858,Ballan
Margaret Isabella: b.1864,Ballarat (d. 1871)
1856 Electoral Roll
Ingleston Arms Hotel
All the best, Anne