William Henry Bowater 1851 1925 Cardiff to New Zealand

William Henry Bowater was born in Cardiff in Wales and died in Sandon, New Zealand.
He married Fanny Gaskin in Lower Hutt, New Zealand in 1874 and they had 6 children that I know of...

Harold Richard Bowater b.1877 - d.1941
Ormond Charles b.1879 - died aged 17 in 1896
Ellen Ethel Elizabeth b.1882 - d.?
Constance Milicent Annie b.1888 - died aged 7 months
Annie b.1888 - was she a twin with Constance, or do I have the birth year wrong?
Cecil Ernest Tancred b.1889 - d. 1936

Can you also help with William's parents and also the ship he emigrated on and the spouses of his children etc