John Campbell of Thurso/Bower

If anyone has any information of John Campbell born circa 1867, who married Janet Bremner on 20th Aug 1886, it would be very much appreciated.

I cannot find any information pertaining to him prior to his marriage. On his marriage certificate it states that his parents are John Campbell (reputed) and Helen Henry.

His children were:
Helen Murray Campbell b.1887
James Campbell b1889
John George Campbell b.1890
Donald Campbell b.1893
Jessie Anne Campbell b.1895
Margaret Campbell b.1897
David Campbell b.1904