Five other siblings were born in New Zealand: Lily May Atkinson and Cybele Ethel Kirk were the only two surviving past childhood.

[1] They had a son, Bernard Callcott Kirk, born 23 April 1888, who served in World War I in the New Zealand Rifle Brigade as a Major and then on 7 November 1940 he signed up again, this time a Captain.

Kirk worked in the New Zealand Geological Survey Department for seventeen years and produced numerous scientific papers published in periodicals such as Transactions of the New Zealand Institute, Annuals and Magazines of Natural History, Nature, Science Gossip, the French Journal of Conchology, and the Royal Society of S.A..[2] More than ten papers focused on different aspects of marine zoology.

By 1896 he was successful in getting the House of Representatives to pass the Orchards and Garden Pests Act which halted imported plant diseases at the borders.

[4] His leadership in the Department of Agriculture provided support for farm exports, loans and cooperative farmer organisations, including the creation in 1916 of the New Zealand Fruitgrowers' Federation.