Never mind, at least I think can help you find yours.
In 1871 George's in London (Hackney), living with a brother Albert. George is 26 yrs, a Shoemaker, born in Norwich, Norfolk - which all ties back exactly to that shipping manifest.
My guess is that his birth will be this:
Births Dec 1843 Osborn George Norwich 13/253
and Ephraim's will be:
Births Dec 1856 Osborn Ephraim Norwich 4b/99
In 1861 Ephraim, I'm pretty sure, is with his parents George & Harriet (nee Warnet, married Jun qtr 1843, Norwich 13/406), in Norwich. Brother Albert is there as well. George isn't far away - staying with his maternal grandparents.
Of course there's a certain amount of conjecture in all this, but a couple of certficates would confirm if I'm right. Email me on email@example.com
if you'd like me to send you the census pages.