Notes:

1 - Apparently this "younger son" went to Jamaica (possibly to join his cousin, Alexander, third son of John the 19th Chief, his father's eldest brother) for we have the statement (see House of Ardess Chapter 26) that he was home in Edinburgh in 1764 and intended to return to Jamaica in the spring of 1765.
From Miss Margaret's statements it might reasonably be inferred that this Duncan died without leaving a son. The Alexander mentioned above was Miss Margaret's grand uncle and if the younger Duncan, as we have suggested, joined Alexander in Jamaica, Miss Margaret would know of his family affairs through her grand uncle, Alexander, with whom her other grand uncle Walter, the Antiquary, and her grandfather, William, were apparently in close touch.
[History of Clan Macfarlane Vol. II (manuscript by James Macfarlane]

2 - 23 August 1755 Alexander McFarlane will names uncle William McFarlane of Dunbar, East Lothian, Scotland; mother Helen Spottiswood and brother John Spottiswood of Spottiswoode, Berwickshire, Scotland; cousin Andrew McFarlane, St. Mary's Parish, Jamaica; widow of Robert McFarlane, late shopkeeper in Salt Markett St., Glasgow; cousin Duncan McFarlane; brother Walter McFarlan of Scotland; brother William McFarlan of Edinburgh (Jamaica Wills, 30:72).
(McFarlane Chronology Scotland (with a few early American & Jamaican records)
[http://lib-operations.sonoma.edu/fin/aaa-0059.html ]

3 - On 23 November 1764, he was in Edinburgh, Midlothian, Scotland and was said to be planning to return to his plantation on Jamaica in the Spring of 1765. Four of his sons are said to have followed him to Jamaica. Sometime later he and his wife, Jean, are said to have returned to Lochlomondside where they lived with their eldest son, Walter at Glen of Luss farm, Luss Parish, Dunbartonshire, Scotland. Duncan spent his last days alone in Kilmaronock Parish, Stirlingshire, Scotland before finally being found dead in the snow in Bonhill Parish, Dunbartonshire.
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane Chapt 5 - 19b]

4 - Duncan, the younger son of Duncan (I). It would seem that this Duncan emigrated to Jamaica and returned to Edinburgh in 1764. A letter dated 23 November in that year written by a member of the Erin's family, (also named Duncan) to his father contains this reference to [this] Duncan:
"There is just now in town a cousin of the Laird of Macfarlane (Walter, 20th Chief ), son to Captain Duncan, come from Jamaica. He goes back in Spring."
Our information ends here. It is for the clansmen in Jamaica to bridge the gap, if it can be spanned from 1764 to 1928. A letter to The Daily Gleaner of Jamaica elicited no adequate response.
[History of Clan Macfarlane Vol. II - a manuscript by James Macfarlane]

5 - Captain Duncan the fifth son had two sons, Captain James and Duncan, but we do not know, as stated above, whether his son Duncan, who was alive in 1764, left a family.
(History of Clan Macfarlane by James Macfarlane 1922)

Family/Spouse: Cathrine Mcgrigor. [Group Sheet] [Family Chart]

Duncan married Jean Macfarlane in 1728 in Dunbartonshire, Scotland. Jean (daughter of Thomas Macfarlane, in Inveruglas) was born in 1710 in Arrochar, Dunbartonshire, Scotland. [Group Sheet] [Family Chart]

Notes:

He resided on Eilean-a-vow before taking up the farm at Glen of Luss on the Colquhoun estate.
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane Chapt 5 - 20a]

Family/Spouse: Agnes Macfarlane. Agnes was christened on 4 Oct 1727 in Linlithgow, West Lothian, Scotland. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Residence: Tippermuir Parish, Perthshire, Scotland

Notes:

He served as guardian to his nephew, Duncan, and resided in Tippermuir Parish, Perthshire, Scotland before he went to Jamaica with Samuel MacFarlane the brother of his elder brother Walter's wife Agnes.
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane Chapt. 5 - 20b]

Other Events and Attributes:

• Immigration: Jamaica, West Indies

Notes:

1 - He is said to have followed his father, Duncan, to Jamaica.
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane - Chapt. 5 - 20c]

2 - I have the author's notes for the History of Clan M'F in my attic. The author, James Macfarlane, received two letters from your Pollard cousins in 1913 which gave the Rev. James's father as James (the latter whom my cousin seems to have conlated with James son of Duncan). The letters show your first James (died 1797) as having two older brothers: one, who went to America or Canada; and another, who went to India and made a fortune. The letter also says that their father's name was unknown.
[E-mail from Terrance Gach MacFarlane to Scott MacFarlane cc'd to me 6 Mar.2011]

Other Events and Attributes:

• Name: James McFarlan [MacFarlane]

Notes:

1 - He may have died on 24 January 1797. He is said to have served as a soldier in Jamaica and to have later resided at Earn in the Barony of Ruskie in Menteith near Doune, Perthshire
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane Chapt 5 - 20d]

2 - I thought that James son of Duncan [CC139 grandson of Andrew of Ardess18th Baron, 15th chief] and this James were the same man before the yDNA test results showed that they were not.
I have the author's notes for the History of Clan M'F in my attic. The author, James Macfarlane, received two letters from Pollard cousins in 1913 which gave the Rev. James's father as James (the latter whom my cousin seems to have conflated with James son of Duncan).
The letters show the first James (died 1797) as having two older brothers: one, who went to America or Canada; and another, who went to India and made a fortune. The letter also says that their father's name was unknown.
[E-mail from Terrance Gach MacFarlane to Scott Macfarlane Aust. cc'd to editor 6 Mar 2011]

Family/Spouse: Mary Hunter. Mary was born on 22 Feb 1725 in Edinburgh, Midlothian, Scotland. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Occupation: Carpenter
• Alt. Birth: Abt 1740, Glasgow, Lanarkshire, Scotland
• Alt. Birth: Abt 1745, Glasgow, Lanarkshire, Scotland
• Immigration: Aft 1783, USA

Andrew married Christian Paterson on 21 Jun 1771 in Govan, Glasgow, Lanarkshire, Scotland. Christian was born on 20 Aug 1749 in Tullibody, Alloa, Clackmannan, Scotland; died about 1825 in USA. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Name: James McFarling [MacFarlane]
• Alt. Birth: 1759, Scotland

Notes:

1 - Name: James Mcfarling
Gender: Male
Birth Date: 04 Nov 1759
Birthplace: SAINT CUTHBERTS, EDINBURGH, MIDLOTHIAN, SCOTLAND
Father's Name: James Mcfarling
Mother's Name: Mary Hunter
Indexing Project (Batch) Number: C11986-8 ,
System Origin: Scotland-ODM ,
GS Film number: 1066753 ,

2 - "The Rev. Mr. James MacFarlane, who was born circa 1759 in Scotland, and died there on 10 April 1823 at Dunfermline in Fife (buried there in the North Churchyard). According to the 'Annals of Dunfermline' The Rev. James MacFarlane was ordained as a colleague to his future father-in-law The Rev. James Husband, D.D. of the Secession Church in Queen Ann Street there in 1785 and they were still in harness together when The Rev. Dr. Husband, a native of St. Andrews, died on 17 May 1821 at Dunfermline in the seventieth year of his age and the forty-sixth of his ministry (buried in the grave of his famous predecessor The Rev. Ralph Erskine near the south-east corner of the North Churchyard); while the survivor died less than two years later in the sixty-fourth year of his age and the thirty-third of his ministry. He married (22 June 1801, Dunfermline) Miss Grizel Husband (baptised there 23 December 1779; died there 13 May 1816; buried there North Churchyard), daughter of The Rev. Dr. James Husband and his wife Margaret Wardlaw, Gentlewoman. They had issue nine children, two daughters and seven sons:"
[from 'The barons of Arrochar and their cadets' a manuscript by Chevalier Terrance Gach MacFarlane Chapt. 5 - 21a]

2 - Tombstone at Dunfermline Abbey.

3 - I have the author's notes for the History of Clan M'F in my attic. The author, James Macfarlane, received two letters from Pollard cousins in 1913 which gave the Rev. James's father as James (the latter whom my cousin seems to have conflated with James son of Duncan). [CC139 grandson of Andrew of Ardess18th Baron, 15th chief]
The letters show the first James (died 1797) as having two older brothers: one, who went to America or Canada; and another, who went to India and made a fortune. The letter also says that their father's name was unknown.
[E-mail from Terrance Gach MacFarlane to Scott Macfarlane Aust. cc'd to editor 6 Mar.2011]

James married Grace [or Grizel] Husband on 22 Jun 1801 in Dunfermline, Fifeshire, Scotland. Grace was born on 14 Dec 1779 in Dunfermline, Fifeshire, Scotland; was christened on 23 Dec 1779 in Dunfermline, Fifeshire, Scotland; died on 13 May 1816 in Dunfermline, Fifeshire, Scotland; was buried in May 1816 in Dunfermline Abbey, Fifeshire, Scotland. [Group Sheet] [Family Chart]

Family/Spouse: Margaret Walker. [Group Sheet] [Family Chart]

Other Events and Attributes:

• Name: Mary McFarlan [MacFarlane]

Family/Spouse: John Binnie. [Group Sheet] [Family Chart]