Hi buckybeaver and fadge36,I started looking up Ros Davies website to remind me of the townlands within a map
of the civil parish of Killyleagh see
http://freepages.genealogy.rootsweb.ancestry.com/~rosdavies/MAPS/KillyleaghTownlands.htmThe Morrows lived in Killyleagh the Coulson only for a generation perhaps .
Griffiths Valuation of 1863 records
http://www.askaboutireland.ie/griffith-valuation who is left after your John and family emigrated. heres the list by townland, some one or more are relatives has the following Morrows to trace by other means
Morrow John Ardigon Killyleagh Down
Morrow James Ballyalgan Killyleagh Down
Morrow John Ballyalgan Killyleagh Down
Morrow John, Jr. Ballyalgan Killyleagh Down
Morrow Robert Ballyalgan Killyleagh Down
Morrow Robert Clay Killyleagh Down
Morrow John Cluntagh Killyleagh Down
Morrow John Corporation Killyleagh Down
Morrow Alexander Cow Street, Killyleagh Killyleagh Down
Morrow Andrew Derryboy Killyleagh Down
Morrow James Derryboy Killyleagh Down
Morrow Mary Derryboy Killyleagh Down
Morrow Samuel Derryboy Killyleagh Down
Morrow Samuel Lisinaw Killyleagh Down
Morrow Robert Rathcunningham Killyleagh Down
Morrow Thomas Rathcunningham Killyleagh Down
Morrow Alexander Shore Street, Killyleagh Killyleagh Down
In the same valuation living in the civil parish of Blaris Lisburn area is the only Coulson to be recorded in Co Down by Griffith at that date. There are 2 homesteads of Morrows in that parish
Going back earlier by about 30 years to the irish Tithe Applotment Books, one finds at
Killyleagh
Morrow, Andrew Townland: Ardigon Year: 1827
Morrow, Andrew Townland: Tullyveery Year: 1827
Morrow, Francis Townland: Tullyveery Year: 1827
Morrow, Hugh Townland: Ballyalgin Year: 1827
Morrow, John Townland: Ballyalgin Year: 1827
Morrow, John Townland: Corporation Year: 1827
Morrow, John Townland: Derraboy Year: 1827
Morrow, John Townland: Tullyveery Year: 1827
Morrow, Joseph Townland: Ballyalgin Year: 1827
Morrow, Robert Townland: Ballyalgin Year: 1827
Morrow, Robert Townland: Ballygosken Year: 1827
Morrow, Robert Townland: Derraboy Year: 1827
Morrow, Robert, Sr. Townland: Ballyalgin Year: 1827
Morrow, Samuel Townland: Ardigon Year: 1827
Morrow, Samuel Townland: Cluntagh Year: 1827
Morrow, Samuel Townland: Derraboy Year: 1827
Morrow, Samuel Townland: Lisnaw Year: 1827
Morrow, Thomas Townland: Ballyalgin Year: 1827
Morrow, Thomas Townland: Ballyalgin Year: 1827 Notes : Castle
Morrow, William Townland: Ballyalgin Year: 1827
Morrow, William Townland: Derraboy Year: 1827
Morrow, William Townland: Lisnaw Year: 1827
Morrow, William Townland: Lisnaw Year: 1827 Notes : for Marsh
Morrow, William, Jr. Townland: Corporation Year: 1827
Morrow, William, Sr. Townland: Corporation Year: 1827
Morrow, Wm. Townland: Derraboy Year: 1827
Blaris this includes Blaris co Antrim and Co Down
Couloon, Wm. Townland: Old Warren Year: 1834
Coulson, Walter Townland: Old Warren Year: 1834
Coulson, William Townland: Ballantine Year: 1834
Coulson, William Townland: Largymore Year: 1834
Coulson, William Townland: Old Warren Year: 1834
Coulson, William Townland: Taghnabrick Year: 1834
Coulson, Wm. Townland: Largymore Year: 1834
Coulson, Wm. Townland: Old Warren Year: 1834
Coulson, Wm. Townland: Town of Lisburn Year: 1834
Morrow none
Moving to family sources other than ros davies
ancestryireland has a
birth
JOHN COULSON 1855 father JOHN Antrim that could be Blaris
marriages
COULSON GRACE 1846 father JOHN Down
COULSON JAMES 1854 father JOHN Down
I couldn’t find possible leads in
https://www.emeraldancestors.com/ Presumably you know other children whose baptisms maybe recorded pinnimg down ehere the family came from
I haven’t time to search familysearch, Proni etc have you any more clues