WOW, I came back on and everybody has found me a wealth of information. Thank you everyone.

I am related via Henry's son James.

I had found only the two children for Henry and Ann.

James son of Henry & Ann COURTNEY baptised 21-Jan 1821 Powerstock
Hannah daughter of Henry & Ann COURTNEY baptised 1-Jul 1827 Powerstock

I am then related through James and his wife Matilda Minterne.

As pennydog stated Freebmd gives:
2 Qtr 1850 Beaminster Reg Dist 8/9 marriage of James COURTNEY & Matilda MINTERNE.

I have been unable to find there marriage date yet.

Their children are:

Matilda Anne daughter of James & Matilda COURTENAY baptised 24-Jan 1851 Powerstock
Asenath daughter of James & Matilda COURTENAY baptised 11-Apr 1852 Powerstock
Anne born about 1855
Frances born about 1856
James born abut 1857
Mary Grace daughter of James & Matilda COURTENAY baptised 13-Sep 1868 Powerstock
Percy son of James & Matilda COURTENAY baptised 13-Sep 1868 Powerstock

As you can see I do not know where Anne, Frances and James where baptized, the census's are below.

As Pennydog showed - I this it should read Sherborne
1851 census RG9/1860/494/2 at Townsend Powerstock
James Courtney b1821 Powerstock smith
Matilda wife b1830 Shorbourne (?)
Matilda daughter age 3 months b1851 Powerstock
1861 Census Alverstoke
James Courtney 40 Blacksmith Dorset Powerstock
Matilda Courtney Wife 30 Dorset Powerstock
Asenath Courtney daughter 9 Dorset Powerstock
Anne Courtney daughter 7 Dorset Powerstock
Frances Courtney daughter 6 Dorset Powerstock
James H Courtney son 4 Hants Portsmouth

Powerstock 1871 Census - RG 10/2026 Enumeration Districts 9 & 10
131 Lynch James COURTNEY Head M M 51 Blacksmith DOR Powerstock 126 24
Matilda COURTNEY Wife M F 41 DOR Sherborne 126 24
Percy COURTNEY Son M 6 DOR West Milton 126 24
Mary COURTNEY Dau F 2 DOR West Milton 126 24

1891 Census Litton Cheney RG12/1663 Page 4
20 Litton Cheney James Courtenay 71 Blacksmith Dorset Powerstock
Percy Courtenay son 26 Dorset West Milton

Based on Tamara finding
I have found a Henry Curtney baptised in Powerstock 18 Sep 1796 son of John and Mary.
I have now found his siblings:

John son of John & Mary CORTNEY baptised 30-May 1790
Robert Ford son of John & Mary COURTNEY baptised 5-Jan 1794
Henry son of John & Mary CURTNEY baptised 18-Sep 1796
William son of John & Mary CURTNEY baptised 24-Mar 1799
Fanny Ford daughter of John & Mary CURTNEY baptised 29-Jul 1800
Betty daughter of John & Mary COURTNEY baptised 1801
David son of John & Mary CURTNEY baptised 3-Mar 1805

Tamara where did you find the marriage information?

On 15 Feb 1820 a Henry Courtney married an Ann Partridge in Powerstock. Witnesses: John Partridge and Faney(Fanny?)Courtney.
This is very helpful

This was the information on Matilda Mintern.

Sherborne 1841 CENSUS HO 107
2; Crackmore Hill Lodge; Mary BARNES; ; 45; F; Ind; Yes
; ; John BARNES; ; 25; M; Glover; Yes
; ; Ann MINTERN; ; 25; F; ; ?
; ; Louisa MINTERN; ; 4; F; ; ?
7; Keepers Old Park; John MINTERN; ; 50; M; Gamekeeper; Yes
; ; Ann MINTERN; ; 50; F; ; Yes
; ; Charlotte MINTERN; ; 20; F; ; Yes
; ; Alvina MINTERN; ; 14; F; ; Yes
; ; Matilda MINTERN; ; 12; F; ; Yes
; ; Hampton MINTERN; ; 7; M; ; Yes

Benjamin Mintern 08 Jun 1823 Haydon, Dorset son of John and Ann
Louisa Mintern 08 Jun 1823 Haydon, Dorset son of John and Ann
Alcina Or Alemina Mintern 25 Nov 1827 Haydon, Dorset, England daughter of John and Ann
Matilda Mintern 27 Dec 1829 Haydon, Dorset, England daughter of John and Ann
Hampden Gilbert Mintern 22 Sep 1833 Haydon, Dorset son of John and Ann

Thank you everybody, I am very excited about these new finds.

Trudy