Hi Gerry,
John O'Kane's father was Harry Roe O'Kane...a brother of my great grandfather Daniel O'Kane. It's possible that Mary O'Kane was the daughter of another brother, James. John and Mary were cousins but I'm not sure if they could have married if they were 1st cousins.
John and Mary had Henry,James,Bridget,Charles,John,Patrick,Catherine,Mary,Bernard,Daniel and Grace.
Henry 1865 married Catherine Mooney.They had at least 2 children,Mary 1896 and John 1900.
I can't send you a pm as you don't have enough posts yet...you might be able to send your email address to me
Regards,
Mary