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William MCCREA was named as an "overseer" in the Will of his son-in-law, Joseph WILLSON. The Will was written in 1751 in Chester County, Pennsylvania. In 1759, Joseph's widow, and William's daughter, Janet, wrote her Will, but did not mention her father, so he may have died by that time.
Just in case Janet used family names for her children, she and Joseph had sons named Joseph, Thomas, John and Hugh, and their daughters were Margaret, Ann, Catherine, Jane and Elizabeth.
This is all I have on my MCCREA line, but will be happy to share what I do have.