Helenrca on Family Tree Circles

Leonardo Pozzi went to New Zealand from Australia in 1879. He worked as a gunsmith in Christchurch. He was originally from Italy. His daughter Matilda married John Keirnan (or Kiernan) in 1883. I'm interested in their children as my grandfather is Leonard (possibly Leonard Lambert) Keirnan.

Mary Ann Cairns Ogilvie married Leonard Keirnan. She departed London 1925 for Melbourne Australia and was possibly married in that year. She has a younger sister called Jean. Any details of Mary's parents please?