Here are earlier baptisms at Monmouth for siblings - on this website

Put the Symbol % in the surname - and put father: Thomas, Mother : Margaret, for baptisms at Monmouth - then we have

Parents: Thomas & Margaret

Thomas WHITCOMB - 4 Augut 1805

William WHITCOMBE - 6 January 1807

Michael WHITCOMBE - 2 April 1809 (buried at Monmouth 31 January 1824 aged 14)

Henry WHITCOMB - 25 October 1812 ***
Mary WHITCOMB - 25 October 1812

George WITCOMB - 17 January 1819

***

Think this is his marriage at Penalt, Monmouth, 16 October 1832 (on this website)

to Martha Shellard

and he is on the 1851 Census, Monmouth with Martha. Henry occupation is a Gardener

and children

Joseph - 18
Margaret - 16 (family name)
Mary A - 11 (family name)
Sarah - 8
Julia - 6
Henry - (family name)
George - 1 - (family name)