I have done some research into siblings for my New Zealand ancestor William Morley Bartle. I have found two younger sisters, Lilian Bartle (b 1876 in Invercargill, New Zealand) and Selina Helen Bartle (b 1879 in Christchurch, New Zealand) and also a brother we already knew about Jonathan Walter Bartle (b 1882 in Christchurch). The family finally settled in Hastings, Hawkes Bay, NZ.
Do any of these names belong to your family? I would love to hear from you.