Amongst Henry Herbert's papers currently contained in the archives at Stanford Universit, California, there is a copy of his parents' marriage certificate.

George Knibbs can be seen in the Ontario Gazetteer and Business Direcory for 1886-7:
Pierce, Howard & Co. (Henry F Pierce, George H Howard, George Knibbs)
Exchange Brokers & Coal Dealers

The later in the same Directory:

Howard George H & Co (George H Howard, George Knibbs)
Brokers & coal

The fact that he is named in the advertisement would indicate that he was a partner in the Business perhaps.
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We can see George, his wife Sarah and two of his children in the 1891 census living in the district of Welland in the town of Niagara Falls, Ontario:
Knibbs Geo. M 40 M - United States - England United States C of Eng
Knibbs Sarah F 40 M W United States - United States United States C of Eng
Knibbs Harry M 16 - S Ontario - United States United States C of Eng
Knibbs Olive F 8 - D Ontario - United States Scotland C of Eng Clergyman

Harry as it appears in the census, was in fact Henry Herbert. He was also known as Harry.
The first location listed after each name is the place where that person was born. The second place name is where his/her father was born, and the third, where his/her mother was born. The transcription I saw seemed to be out of sync slightly with the occupations listed being relevant probably to the name below that indicated on the list. The person above George (a 17 year old girl named Alice) was listed as a Coal Dealer. Similarly, Olive Knibbs is listed as a Clergyman.

Daughter of Henry b.27 Dec 1820 & Augusta Irving LONGBOTHUM b.18 Aug 1829 .

Amongst Henry Herbert's papers currently contained in the archives at Stanford University, California, there is a copy of his mother's will.
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We can see Sarah living at Los Angeles Township Los Angeles City Precinct 340, Los Angeles, California, aged 69 and a widow. It states that she and her parents were all born in New York, USA