The Sexsmith yDNA project that Bonny R. started ha ended but it did see some interesting results:
Direct male descendents of George R. Sexsmith and Mary Smiley widow Kennedy, Tobias Sexsmith and Ann Sharp and Simon Y. Sexsmith and Margaret Holcombe matched each other exactly so they all have a close common ancestor.. A descendent of Thomas Sexsmith and Elizabeth Wall was one marker different so also a common ancestor and another descendent of George R. and Mary also was one marker different. But a different marker than the Thomas descendent. A geneticist told me quite possible to find a mutation after 200 years in same family.
George R. family has his father as James George Sexsmith; Tobias family has his parents as Tobias Sexsmith and Rebecca Hill; Simon Y. family has his parents as John Sexsmith and Ann/Nancy Grant; Thomas family has his parents as John Sexsmith and Caroline Brahant all from Ireland.
A story in the Simon Y. family was that he was from Northern Ireland and not related to the Southern Ireland Sexsmiths but yDNA shows this story to be mistaken, at least as far as the relationship goes.