I do know this much about Robert Johnston and Martha Ralston's family,
Robert Johnston/Johnson Jr, m.Caroline McClannahan. His mother in law married
David Daggett English,after the death of her husgbnad. David was the bro to
Nancy Ralston English,whose parents were Thomas Jefferson Savory English and
Martha Ralston. The Johnston/Ralston side is my maternal direct line through the
English/Ralston line through their daughter,Martha Melvina English.
You probably know that the Johnston's changed the spelling of their name to
Johnson after comming to In.