Who is Henry Lucas?

[ElizabethHerts]

I have John Howick born Q2 1841 in Graffham, Sussex.

He marries Ann Tucker in 1866. They have 8 children, 3 of whom are dead by the 1911 census. I have them all the way through the censuses, except for 1891.

1871
https://www.ancestry.co.uk/interacti...97108644/facts

1881
https://www.ancestry.co.uk/interacti...02/edit/record

1901
https://www.ancestry.co.uk/interacti...07/edit/record

1911
https://www.ancestry.co.uk/interacti...74/edit/record


There wasn't any sign of them in 1891 until I found this:
https://www.ancestry.co.uk/interacti...03/edit/record

Henry Lucas Head 50 Mar Shoe Maker Sussex Graffham
Anne Lucas Wife 51 Mar Sussex Wivilsfield
John Howick Son of Wife S 15 Messenger Sussex Bersted
Bertha Howick Daur of Wife 7 Sussex Bognor

Apart from his name, Henry Lucas has the same details as for John Howick! John and Ann are together again in 1901 and 1911. Is John hiding under an alias?

I couldn't find anything on Henry Lucas born Graffham.