have you a reference? - there is a will for a Jony Keneene in 1673 she mentions husb Donold Kaneene + 2 children + also a dau in law so one child must have been born at least 15 years prior.
Judging from the wills on Brian Lawson's site he had a Kaneene ancestor - a nearly complete set for 18th C Andreas.
Otherwise I'm not quite sure what you are seeking