Hi Gail,
From what I understand all his siblings stayed in NZ. I have not managed to find his youngest sister yet

His siblings were
James Tippett 27/10/1876 - 25/6/1940
Harriet 29/9/1878 - 29/4/1879
William 29/9/1878 - 10/4/1879
Edith 11/5/1880 - 19/3/1911
Amelia AKA Millicent 26/12/1882 - 27/9/1952 (My great grandmother)
Agnes 8/9/1885 - 20/3/1961
Frederick Thomas 27/10/1887 - 30/4/1955
Ellen 19/5/1894 died after 1920
All born Auckland
Newbe
PS: have edited dates that were wrong