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Is the disappearing Henry the one from 1846, or is there a son of Joseph 1846 called Henry too?

Might there be an error in the year of birth? I have both Henry & Joseph as born about 1846, not impossible, but less than probable?

This one....

1851 England Census
about Henry Mortlock Name: Henry Mortlock
Age: 5
Estimated Birth Year: abt 1846
Relation: Nephew
Gender: M (Male)
Where born: Lambeth, Surrey, England

Civil parish: Lambeth
Ecclesiastical parish: All Saints
County/Island: Surrey
Country: England

Street Address:

Occupation:

Condition as to marriage:

Disability: View image

Registration district: Lambeth
Sub-registration district: Waterloo Road Second
Household Members: Name Age
Henry Mortlock 34
Joseph Mortlock 27
Henry Mortlock 5 <<<<
Henry Manning 40


Although this is possibly his birth entry..

England & Wales, FreeBMD Birth Index, 1837-1915
about Henry Mortlock Name: Henry Mortlock
Date of registration: Jul-Aug-Sep 1843
Registration district: Lambeth
Inferred County: Greater London, London, Surrey
Volume: 4
Page: 308

Thank you Prickles.

So where have all the Motlocks disappeared to? Name change?