i googled william manson/caithness,,,,,you will see ancestry message boards,study these messages. I had a search elsewhere,and found william born 13/11/1750 ,baptised 15.5/1751 dunnet. son of donald manson/janet anderson. william listed as a weaver ,served revolutionary war.lived kentucky. his wife elizabeth sinclair about 1750,his first child named francis, it seems he remarried when elizabeth died,wife 2 unknown. he emigrated 1775 on ship marlborough arrived savannah-georgia dec 1775,,, also on board was janet manson born 1756,this could be his mother janet anderson. i suggest you also browse 1841 census FREECEN also worldconnect,which you can see on the ancestry web-page,if lucky you may get all the generations of william further back, regards helen.