m. (1) Frances Hester Powys, (2), in 1842 one of Margaret Mayler, Louisa Robon, Rachel Beadle, Frances Louisa Tatham.

He was 1st s. of Rev Thomas, Prebendary of Westminster.  On matric at CH CH on 19 Mar 1819 he was 19, so born in 1799-1800.

Baptism not found, but it was with the spelling of Caustan:

First name(s)           Thos Henry
Last name               Caustan
Birth year              1800
Birth date              09 Mar 1800
Baptism year            1800
Baptism date            08 Jun 1800
Father's first name(s)  Thos
Mother's first name(s)  Mary Ann
Parish                  St Margaret, Westminster
County                  Middlesex
Country                 England
Archive                 City of Westminster Archives Centre
Record set              Westminster Baptisms
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Not found (yet) in 1841 census:

In 1851 he was at South Grove, Saint Pancras, St Pancras, London and married to a Nancy L, so his new wife was not one of the above, or might she have used a new name to avoid confusion with her predecessor?  The household was:

First name(s)  Last name  Relationship  Marital status  Sex  Age  Birth year  Occupation  Birth place
Thomas H Causten  Head      Married    Male    51  1800  Incumbent Minister  Westminster, Middlesex
Nanci L Causten   Wife      -          Female  50  1801  -                   St Pancras, Middlesex
Annetta Causten   Daughter  Unmarried  Female  15  1836  Scholar At Home     St Johns, Middlesex
Anne E Causten    Daughter  -          Female  13  1838  Scholar At Home     St Johns, Middlesex
Stephen Whaller   Servant   Unmarried  Male    23  1828  Footman             Burbage, Wiltshire
Harriet Baker     Servant   Unmarried  Female  24  1827  Laundry Maid        Somerset
Amelia E Yield    Servant   Widow      Female  33  1818  Cook                Monmouthshire, Wales
Hennetto Quick    Servant   Unmarried  Female  25  1826  House Maid          Kentish Town, Middlesex
Ann Wheeler       Servant   Unmarried  Female  18  1833  Under Housemaid     Wiltshire

Ref:
Archive referenc   HO107
Piece number       1498
Folio              662
Page               8
Combined:          RO107, piece 1498, folio 662, p. 8
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Their marriage abstract detail in the London Courier and Evening Gazette of 9th April 1831:

On Tuesday, the 5th instant, at St John’s Hampstead by the Hon, and Rev. Horace Powys, the Rev. Thomas Henry Causton, vicar of St Botolph, Aldersgate, and eldest son of the Rev. Dr. Causton, Prebendary of Westminster, to the Hon. Frances Hester Powys, fifth daughter of the late Lord Lilford.
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And this Marriage Licence was issued:

“LONDON DIOCESE                 4th April 1831
“
“APPEARED PERSONALLY the Reverend Thomas Henry Causton of the Parish of Saint Botolph Aldersgate in the County of Middlesex Clerk a Bachelor of the life of twenty one years and afterwards

“and prayed for a Licence for the Solemnization of Matrimony in the Parish Church of Saint John Hampstead in the County of Middlesex
between him and the honorable Frances Hester Powys of the said parish of Saint John Hampstead a Spinster of the age of twenty one years & upwards

“and made oath that he believeth that there is n o Impediment of Kindred or Alliance, or any other lawfuyl Cayse, nor any Suit commenced in any Ecclesiastical Court to bar or hinder the Proceeding of the said Matrimony, according to the tenor of such Licence.  And he further made Oath, that the said honourable Frances Hestger Powys hath had her usual Place of Abode within the said Parish of Saint JKohn Hampstead for the Space of Fifteen Days last past.

    [sgnd]       Ellen Mary       T H Causton

Sworn before me
    [sgnd]       John Darlington
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