Hugh GREGG {M} [P256] = Marion MCWHIRTER {F} [P257]
Married 9 Dec 1815, Barr by Girvan Ayrs Scotland IGI-M11580-2
Hugh GREGG
Born 10 May 1763, Barr Ayrs Scotland IGI-C11580-2
Christened 17 May 1763, Barr Ayrs - Scottish Church Records FR77
Died 19 Jun 1862, Shallochwell Barr Ayrs  [Died Age 99] Death Cert
IGI - name: Hugh Gregg baptism 17 May 1763 baptism/christening place: , BARR BY GIRVAN, AYR, SCOTLAND birth date: 10 May 1763 father's name: George Gregg : C11580-2 system origin: Scotland-VR
Hugh was aged 52 when he married Marion McWhirter [SCR FR215] - poss 2nd marriage? 
Hugh's Parents verified on his Death Cert. Hugh was 99 years old when he died. Hugh and Marion both died in 1862.
Info Mary Martin April 2008:
Hugh Gregg & Marion McWhirter in Barr in the 1861 census. I was pretty sure it was him and so I got the Death Extract. It was - wife & parents as per your website. He died at Shallochwell 19 Jun 1862 aged 99 yrs. His wife died the same year but before him as he was described as a widower.
Marion MCWHIRTER
Alias Marion GREGG (9 Feb 1815)
Born 3 Nov 1781, Barrr by Girvan Ayrs Scotland  IGI-C11580-2
Christened 3 Nov 1781, Barrr by Girvan Ayrs Scotland  IGI-C11580-2
Died 1862, Barr Ayrs [Died before June]
Pending further research:
IGI - name: Marrion Mcwhirter baptism 03 Nov 1781, BARR BY GIRVAN, AYR, SCOTLAND father's name: John Mcwhirter, C11580-2
This could be her Fathers 2nd or 3rd marriage to step a mother as no siblings were found before the 1785 matrriage date below:
IGI - Marriage: JOHN MCWHIRTER : MARRION MCNARRON: 19 NOV 1785   Barr By Girvan, Ayr, Scotland: M11580-6 
Thus could then be Marion's half brother:
IGI - name: John Mcwhirter baptism 28 Nov 1786 baptism BARR BY GIRVAN, AYR, SCOTLAND father's name: John Mcwhirter C11580-2
Marion ( _ _ ?_ _ ) died about 80 years of age in 1862,  the same year that her husband Hugh died aged 99
Some records spell first name as Marron for Mareon. 
John GREGG {M} [P214] = Elizabeth MCWHIRTER {F} [P215] > Family [F67]
Married 15 Nov 1845, Barr by Girvan Ayrs Scotland IGI-M11580-4
John GREGG
Born 1819, Barr by Girvan Ayrs Scotland IGI - C11580-2
Christened 2 May 1819, Barr by Girvan SCR FR137
Died 4 Mar 1863, Shallochwell  Barr Ayrs GROS 580/00 0004
IGI - name: John Gregg gender: Male baptism/christening date: 02 May 1819 baptism/christening place: , BARR BY GIRVAN, AYR, SCOTLAND birth date: 15 Apr 1819 father's name: Hugh Gregg mother's name: May Mcwhirter[Probably Marion] McWhiter] indexing project (batch) number: C11580-2 system origin: Scotland-VR source film number: 1041333
This John Gregg was 1st cousin to Andrew Greig born 1813 at Glashculloch Barr. They shared the same grandfather George Gregg [P250] but different grandmothers.
John died aged 44 and heads the list of family names on the monument to this family at Barr Churchyard.
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Note:John Gregg 27/3/1863 Ayr Sheriff Court Wills 5 pages SC6/46/1 farmer in Shalleochwell in parish of Barr - Also Extract Trust Disposition and Settlement with Codicil
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John Gregg 27/3/1863 Ayr Sheriff Court Inventories 3 SC6/44/30 farmer in Shallochwell, parish of Barr Inventory
Elizabeth MCWHIRTER
Alias Elizabeth GREGG
Born 1821, Barr or Kirkmichael
Died 15 Dec 1907, Belleview Barr Ayrs (M.I) GROS 580/00 0007
Website: http://www.stevensonfamilytree.co.uk/ps02/ps02_226.htm states Elizabeth's Parents as: Father David McWHIRTER. Mother Whilhelmina JAMIESON 
Elizabeth is listed on the family monumment at Barr Churchyard dedicated originally to husband John Gregg. Elizabeth died aged 86.
Born 22 Jul 1821, Barr by Girvan Ayrs Scotland IGI-C11580-4
Christened 30 Jul 1821, Barr by Girvan Ayrs Scotland IGI-C11580-4
IGI - George Gregg baptism 30 Jul 1821 BARR BY GIRVAN,AYR,SCOTLAND birth date: 22 Jul 1821 father's name: Hugh Gregg mother's name: Marion Mcwharter C11580-4
Plus SCR
Born 27 Aug 1824, Barr by Girvan Ayrs Scotland IGI-C11580-4
Christened 29 Aug 1824, Barr
IGI - WILLIAM GREGG  Male    Birth:  27 AUG 1824   Christening:  29 AUG 1824   Barr By Girvan, Ayr, Scotland Parents:  Father:  HUGH GREGG   Mother:  MARION MCWHIRTER   Source Information: 
 Batch No.:  Dates:  Source Call No.:  Type:  Printout Call No.:  Type: C115804  1820 - 1854  1041333   
IGI Marriage: groom's name: Hugh Gregg bride's name: Marran Mcwhirter 09 Dec 1815  Barr By Girvan,Ayr,Scotland: M11580-2
Hugh was aged 52 and Marion McWhirter was aged 33 when they married [SCR FR215] - poss 2nd marriages? 
SENSUS: Piece: SCT1841/580 Place: Barr-Ayrshire Enumeration District: 5
Civil Parish: Barr Ecclesiastical Parish, Village or Island: Barr Folio: 5 Page: 3 . 
Address: Mieckle Shalloch. On 6 June 1841
Surname   First name(s)   	Sex   Age   Occupation   Where Born   Remarks   
    GREGG   Hugh   		M   77       			Ayrshire         
    GREGG   Merran   	F    59      			Ayrshire        [Marion]
    GREGG   John   		M   21       			Ayrshire         [ P214 ]
    GREGG   George   	M  18      				Ayrshire         
    MCWHIRTER   Elizabeth	F   20   Female Servant    		Ayrshire        [ P215] Future wife to John [P214]
    MCMURTRIE   John   	M   10      Male Servant    		Ayrshire  
            - - - - - - - - - - - - -             - - - - - - - - - - - -             - - - - - - - - - - - -
Piece: SCT1851/580 Place: Ayr -Ayrshire Enumeration District: 5
Civil Parish: Barr Ecclesiastical Parish, Village or Island: Barr Folio: 0 Page: 3 Schedule: 7
Address: Shalloch Well. On 30 March 1851
Surname   First name(s)   Rel   Status   Sex   Age   Occupation   		Where Born   Remarks   
    GREGG   Hugh   	  Head   	M   	M  	87   Retired Farmer    	 	Ayrshire - Barr 
    GREGG   Marian   Wife   	M   	F  	69      				 Ayrshire - Barr 
    GREGG   John      Son   		M   	M   31   Farmr 800 acres Employs 1lab    Ayrshire - Barr [P214]
    GREGG   Elisabeth  Daulaw   	M   	F   29       		Ayrshire - Kirkmichael   [ P215]
    GREGG   George  Grndson   -   	M   	4       			Ayrshire - Barr 
    GREGG   David     Grdnson   -   	M   	2       			Ayrshire - Barr 
    GREGG   Marian   Grnddau   -   	F   	9m       			Ayrshire - Barr 
    THOMSON   John  Servnt   	U   	M  	24  Farm Servant    		Ireland - -  
    WILSON   Mary      Servnt   U  	F   	16   Farm Servant    	Ayrshire - Barr 
    WILSON   Agness  Visitr   	U   	F   	21       			Ayrshire - Barr 
            - - - - - - - - - - - - -             - - - - - - - - - - - -             - - - - - - - - - - - -
CENSUS Year 1861. On 7 April 1861
Apx D.o.b Surname	Forename 	Sex  Age	 District/County GROS Data
1764	GREGG	HUGH	  	M    97 	BARR AYR 580/00 005/00 003
1781	GREGG	MARION	  	F     80  	BARR AYR 580/00 005/00 003
1856	GREGG	ELIZABETH 	F       5 	BARR AYR 580/00 005/00 003 [Grandchild?]
1858	GREGG	JOHN W	  	M      3  	BARR AYR 580/00 005/00 003 [Grandchild?]
1861	GREGG	JAMES	  	M      0  	BARR AYR 580/00 005/00 003 [Grandchild?]