Hmm aren't elusive ancestors just great

So apparently Samuel and Mary farmed the tack at Ardachy boleskeine and their sons took over during the 1840s
Hopefully I can find someone who knows the local history of the lochaber area, and the families who lived there. it seems there are others trying to research this line with not much success.
Samuel seems to have fallen off the face of the earth, his name only mentioned on death and marriage documents of his children.
I don't know where to go from here so I'm tempted to find a professional!
Oh and I just found out apparently there was an ancestor/relative in the battle of Waterloo or the battle 'into the valley of death rode the 600' but another 'story' and no names!
Mary's family is a little easier to trace, but gives no clue on her husband Samuel.
Thomas' obituary states him being born Dochnassie Lochaber.