Hi Clare
I had read the previous message regarding a John Chaplin who relocated to wales in 1871 from Easthampstead, Berkshire and thought this might be of some help. William Chaplin (John's Father)was born in Easthampstead in 1801 and married a Sarah Parker (Born 1803) also from Easthampstead, Berkshire. I have been unable to track the date of the marriage so far but i do know that they had in total seven children.
Elizabeth Chaplin B1823
John Chaplin B1826
James Chaplin B1831
Henry Chaplin B1834
Mary Chaplin B1837
Thomas Chaplin B1839
Joseph Chaplin B1848
The children were all born in Easthampstead Berkshire. I am related throught Henry Chaplin but i do know that John Chaplin B1827 did move from Easthampstead to wales in 1871 and in the process moved his children with him. His wife Elizabeth Gatland died in 1869 and left him with 5 children to look after, one being your George Chaplin 1851. George Chaplin did indeed marry Sarah form clutton somerset. Just to confuse you even more, William Chaplin 1801 father was Edward Chaplin 1770 and his mother was Esther/ Hester Cock B1764 and their marrage date was the 17 Jan 1796 Easthampstead.
Good luck!