Apologies for confusion. I made a mistake in writing the last email. I have a problem with written materials since suffering a stroke. I have rechecked information and now the following is corrected.

Children John, Thomas & James were mentioned in a land Sale of Chibanagh and they and their wives are detailed in the Sale. Thomas Cretney is the child of Joseph Cretney and Anne Quirk – he married Ann Clucas. Details in the Deed of Sale gave information of the three brothers and their wives.

You are correct the Will of Robert does not clarify the Thomas/Ann Clucas issue.
Allan Cretney