So why does George Charles born 1905 have mother's maiden name BOON
ADDED
I reread the attestation forms for each Frederick, you are assuming they are the same man.
Look at the signatures they are not the same.
1871 Frederick has 2 children GEORGE CHARLES and Ellen
1876 Frederick has 3 children, Maude, GEORGE FREDERICK and Ellen
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1876 Frederick says his father is Edward Verrier and mother is Jane Elizabeth- his wife is Elizabeth and he can't remember when they married (so they probably didn't)
1870 Frederick remembers exactly when he was married 6 October 1895 to Jane Elizabeth Bryant
1876 Frederick is of 50 Warren Street and is discharged to 36 Claredon Street, Ruston Road.
1870 Frederick address is always Rising Hill Street, Pentonville.
1876 Frederick has tattoos on his medical form
1870 Frederick does not.
1876 has a pale complexion, brown eyes and fair hair
1870 has a fresh complexion, brown eyes and fair hair.
I would ask are they cousins?