the Nixon connection gave the name Mark - Mary Nixon w/o Henry Watterson was d/o Mark Nixon + Mary Qualtrough - unfortuneately you have now reached back before surviving Rushen parish regs as she was prob born pre 1718 - however the Qualtroughs are also very well researched - Mary Nixon als Qualtrough will - expressed 24 oct 1779;dau margt waterson als nixon;nephew edwd qualtrough;niece isabel qualtrough;sis sarah qualtrough;son mark exor

Mark Nixon was noted as of Fisgarth when he bought property in Port St Mary in 1765 (south side sale Oct 1766 #198) one of many things you can research at Museum - at this preiod wills and land records will be your main route back