memysel on Family Tree Circles

looking for information (aren't we all?) about the STEWART families of Lettershunna, Invernahayle, Ardsheal, and most of the descending families of Appin
Robert STEWART 1st Lord of Lorne married Johanna STEWART (my 16th great grand aunt)daughter of Robert 1st Duke of Albany

anything on these families will be gratefully received
regards memysel