Hello Nancy. I just came across your Sep 25th note to William. Please see my just posted comment to William Douglas dated Jan 13, 2019 concerning Joseph Douglas. The DNA sequence for the 3rd GrGrandson of Joseph Douglas (1768-1843) [my wife's bro.] is nearly identical to that of George Washington Douglas (1790-1852) of Copiah, MS. I believe Geo. Washington Douglas was John's son. This would indicate that Joseph was John's brother, along with William. We are trying to find out Joseph's parents & siblings. If you have access to Ancestry.com, see family tree of Max Marshal Douglas for more details. We'll be glad to share what info I have. Bill
The more information you can give about the people you mention, the more chance there is of someone else connecting with your family.
Dates and places of births, deaths and marriages all help to place families.
Professions also help.
'My great-grandmother mother was a Douglas from Montrose' does not give many clues to follow up! But a bit of flesh on the bones makes further research possible. But if we are told who she married, what his profession was and where the children were baptised, then we can get to work.
Maybe it is time to update the information in your profile?