my thanks to frances, sylvia and donna for your help. when i first found the marriage for john and isabella, my first thought was paul mylchreest and eliza hester faragher could be the parents of john and i sent for the marriage license to make sure.
i have noticed another john mylchreest born 29/11/1868 in arbory to john mylchreest a masons labourer and elizabeth corkill. i dont know wether or not it could be any help but the witnesses of john and isabella marriage were john thomas kelly and annie kewley.