Appears Ivy Kathleen SLADE (1903-1986) was adopted by Donald Henry (c1874-1952) and Elizabeth Leslie McKENZIE (c1877-1957) who later lived/farmed at Kiritaki near Dannevirke. They married in 1906, and had the following children: John Murdoch (1907-1979), Leslie Thomas (1910-1971), and Mabel Agnes (1916-2009).
In 1909 and 1916 Ivy is recorded as attending Tipapakuku School; her NOK is Mrs McKenzie of Tiratu. In 1915 Leslie is also attending the same school.
When Ivy married for the first time in 1923 (to a local mechanic, Edward Percy John DENNIS, aged 25yrs; he died 1926), they were married 'at the residence of the bride's father, Kiritaki - according to the Notice of Intention to Marry. Don't know where her second marriage in 1933 to Clive Edmund WRIGHTON (1903-1983) took place.
I can get newspaper death notices for the three McKenzie children but that would be late next week.