Hutcheson/Hutchinson/Hutchingsonand Kemp Family

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Can anyone help make a connection please. The baptism of any more children or the marriage of his parents.
Born circa 1733/4
William Hutcheson' burial 1800 at St Stephens states his parents were Michael Hutcheson and Elizabeth late Kemp he was 66 years old and a widower.
The only baptism I have found is for a Sarah 1738 of Michael and Elizabeth Hutcheson.

He had a brother Michael -(circa 1742-1808) and a sister Elizabeth Kett -from his will. (I have found the Kett children named in his will).

There is a Michael Hutcheson who married Mary Ducket at St Julian 1724, did she die and he then married Elizabeth?
Also a James Hutcheson married Lydia Murrell widow 1745 and Mary Hutcheson married James Murrell 1748 both at St Michael at Plea. He left money to the children of James Murrell but no relationship mentioned.

Thanks in advance