I am not sure if I believe this entry: DOUGLAS, James was born ABT 1880 in Co Down, (son of William Johnston) was in the 1901 census for Ballyhay, Ballycross, County Down, Ireland because I do not understand why he would be called Douglas.
The 1901 census has this:
Residents of a house 65 in Ballyhay (Ballycross, Down) Show all information Surname Forename Age Sex Relation to head Religion Johnston William 80 Male Head of Family United Free Church of Scotland Johnston Isabella 30 Female Daughter United Free Church of Scotland Mculley Minnie 24 Female Niece United Free Church of Scotland McGampsey Lavinia 10 Female Niece United Free Church of Scotland Johnston Lizzie 3 Female Niece United Free Church of Scotland Douglas Jane 17 Female Daughter Presybterian Douglas Essie 9 Female Daughter Presybterian Douglas Maggie 7 Female Daughter Presybterian Douglas Aggie 13 Female Daughter Presybterian Douglas Lizzie Ann 23 Female Daughter Presybterian Douglas Alexander 50 Male Head of Family Presybterian Douglas James 21 Male Son Presybterian Douglas John 15 Male Son Presybterian Douglas Alexander 11 Male Son Presybterian Douglas Robert P 19 Male Son Presybterian Douglas Essie 48 Female Wife Presybterian
All the above is of course later than the timescale you are looking at, but I hope it might help.
You refer to 'Douglas Homestead'. This does not sound correct to me. Irish homes/farms were not usually named 'Homestead'.
we have an Irish group, which you might consider joining.
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?