There is a tree for Catherine on familysearch site, gives her parents as Thomas Keef 1701 and Susanna Langworthy 1702, and a son born 1787 Garland Langworthy Wills.Catherine bapt 1745 Maker, cornwall
Would suggest you try familysearch site as there is probably more you can get for free.
The tree also has Michael Wills death in 1798, but would need checking, as there are more than one it could be.