If you use the Church of Latter Day Saints Family Search site : and search for UNDERWOOD, Eastington - there are many records including:

a baptism of George UNDERWOOD - 29 June 1799 - parents George & Sarah

This way you can form family groups.

http://www.familysearch.org

Also on from this site a George UNDERWOOD married a Sarah HAYWARD 27 December 1790 (Eastington & Alkerton)

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On later census - George UNDERWOOD says he's married, but Mary isn't there - this could be her.....

1851 Census, Greyfriars, Glos. St Mary de Crypt

James WARNER - 34, Porter, born Eastington
Hannah WARNER - 31 - ditto
Ann WARNER - 2 - born Glos.
Mary UNDERWOOD - Visitor, 55 - Cloth Worker, born Eastington, Glos

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This is George on the 1861 census : Glos Littledean, lodging with Samuel BRAIN - Grocer (he is with this BRAIN family on the 1851 census, Broad Street, Littledean- saying he's married, and working as a labourer in Coke Yard)

Broad Street

Samuel BRAIN - 60
Sarah BRAIN - 57
Eliza BRAIN - 22
Eliza Morgan BENNETT - 9
Richard KEAR - 23
George UNDERWOOD - 60 - mar - Garden Labourer, born Easington, Glos