William was born in 1858 . He is the son of Francis Jack and Elizabeth McDonald.and came to NZ with them in 1864. He did not marry.
MESSRS JACK BROTHERS (William Jack, Thomas John Jack, and James Francis Jack), Sawmillers, Kotuku. The mill of Messrs Jack Brothers is one of the largest on the West Coast, and is situated about a mile from the Kotuku Siding, to which timber is conveyed by a tramway. There is a boiler and engine, each of thirty-five horse-power, and two breast benches; the steel breaking-down bench, with wire rope attachment, was the first of that description fitted up on the Coast. The output from the mill is large. Messrs Jack Brothers have the command over some good timber country, and a large amount of white pine is shipped to Australia. In addition to the ordinary timber-sawing, a good deal of silver pine sleeper-cutting is also carried on. Mr. WILLIAM JACK , of the firm of Jack Brothers, is a son of the late Mr. Jack, of Winton, Southland, who was for thirty years a sawmiller. He was born in Tasmania in the year 1860, came to New Zealand with his parents about 1864, and was educated in Invercargill. Practically, his whole life has been spent in sawmilling work, with his father, and later on in partnership with his brothers. The present mill was established in the year 1902.
Mr. THOMAS JOHN JACK , of the firm of Messrs Jack Brothers, was born in Tasmania, and came to New Zealand in the year 1864. He has had a life-long experience in the sawmilling industry. Mr. Jack is married and has six children.
Mr. JAMES FRANCIS JACK , of the firm of Messrs Jack Brothers, [...] was brought up to sawmilling, and has since continued in the trade in partnership with his brothers. [1]
He passed away in 1923 age 65 [2] and is buried in the Sydenham cemetery (Block 43C. Plot 54)
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https://www.findagrave.com/memorial/166063236/william-jack
It shows his exact date of birth: 10 Oct 1858 in Tasmania. It also shows burials of his parents, 2 sisters, 2 brothers.