Wee Charlie Montgomery Fermanagh Around 1790

has any of my distant relations got any further back. ie charlies father, grandfather would love to hear from youse. my grandfather was one of john and jane dunsmore montgomerys son he was david dunsmure(born 1902) who moved to fife over 60 years ago from blantyre.I am william son of alexander one of david dunsmure and catharines sons (my grandfather and granny)would like to trace as far back as poss thanks. Wullie Monty.