William John married twice.
KERNOHAN William John (Birth Place ANTRIM)
WELLDON Catherine Bertha
Year: 1866
Reg Number: 4201
He and Bertha were divorced.
Kernohan William John & Kernohan Catherine Bertha
Corespondent King Thomas L [1861-84/128]
Kernohan William John & Kernohan Catherine Bertha
Corespondent Meachan A P [1861-84/128]
KERNOHAN William John (Birth Place: ANTRIM)
POWER Johannah
Year: 1873
Reg Number: 582
Some newspaper details in 1868
http://trove.nla.gov.au/ndp/del/article/5827467?searchTerm="kernohan v kernohan"&searchLimits=
Sue