I just noticed the notice of your response. I've actually just come back from a visit to Nova Scotia and will be working on my version of a "family tree". Right now I'm drowning in bits of information that haven't been tied together.
I've known about the Donald in Megantic Que. for some time, but haven't been able to tie him through a solid record of any sort to the Donald/Daniel who was Malcolm's son at Six Mile Brook.Quebec seems a long way to stray.There is on file a petition for land grant of 400 acres at Six Mile Brook by Malcolm shortly after they arrived in 1817.The petition lists Malcolm, his children and their families.He seemed to justify the request as being 100 acres for each of his sons.They were all living on the land and he finally got the deed in his name sometime around 1828.In 1833 he deeded 100 acres each to James, Daniel and Duncan, so I have assumed that Daniel was still there at that time.The last hundred apparently stayed in his name. Malcolm also acquired another hundred acre tract in 1830. The deed transfer is the last reference to Daniel I have found in Nova Scotia. One complication is that in Guysborough County (east of Pictou County in NS) there is a Duncan Sillars that I have long hypothesized might be a brother of Malcolm.This Duncan also had a son named Donald, born in 1803. The next information I have on the land grant is on the "Church Maps" of 1867.Well before then James had sold his piece and headed off for River John, about 15 miles away, where he started buying up land for himself and his sons.Malcolm Jr. stayed single and in Six Mile Brook for the rest of his life.Duncan lived to an old age, with his land going to his son William who passed it on to his son John D.The final hundred acres seems to have ended up after Malcolm Jr's death in the names of the two daughters during their lifetime.The land grant maps are on-line as are the Church maps.There is a third set of maps, the Historical Atlas of 1879 by Meacham which also shows Sillars ownership.I think this might be onlline also, but I found it at the Pictou Roots Society office in New Glasgow and photographed sections. Trying to trace subsequent land transfers might be one way of finding out what Daniel did when.I haven't had time to get into that yet.The records might be in Pictou.There may also be information at the Archives in Halifax.I haven't been there either. The land now is mostly in a single ownership which might be a commercial mining operation.I've heard that there are gravel pits on it.I have driven around the area (one paved road, the others not), a driveway that looks like a logging road leading to the interior. In any case, I have tons of data on the rest of the family, especially on the line of James who managed to produce 12 children - five who came with the group from Arran and seven more born in Nova Scotia.
I'll be interested in hearing how you make out in further research.