The connection I believe is that the majority are Children of Charles Plumridge bn 1797 Great Marlow, who married Jane.

Marriage 1 (M1)
William Henry first son christened in Marlow in 1818
Witness George likely to be 3nd son born 1825, who marries in M2, Arthur 4th son christened 1833, but likely born a few years earlier.

Marriage 2 (M2)
George 3rd son bn abt 1825, ?Christened Cookham 1826?Emigrates to the USA circa 1860s
witness Emma unknown relation, Edward 5th son

Marriage 3 (M3)
at the moment I have no connection for Emma, so hard to ascertain this one.
Witness is presumably the father or brother

Marriage 4 (M4)
Edward 5th son, apparently emigrates to Australia 1875, d 1895, but the spouse who apparently travels (Anne) is different.

Marriage 5 (M5)
Charles 2nd son born about 1822 but apparently not Christened in Marlow or Cookham

It is not clear to me that the christenings in Cookham are the same family, because it would then not match up tot he census and there would be an awful lot of Children. However, various children were Christened in Cookham (1824-1836) and Charles' occupation was given as builder. The transcription I have for Marlow didn't capture their occupations, but there are Christened Children there from 1818-1821. In the 1851 census he describes himself as a Farmer of 200ac, and by 1871 as a retired Builder. The census returns are surely the same person, because the wife's palce of birth is the same (Stokenchurch).

Any ideas on Jane's maiden surname?