Hi Pop,
I can help with some of this;
1.
Henry's actual birth date. This is not on the IGI, so sorry can't help with this.
2.
Birth, Death details of George and Maria. Free BMD gives a death registration for George SHILLITOE, Dec. quarter 1847, Newington reg. district (4 354) Which looks about right as he's present on the 1841 census & Maria is widowed by 1851.
3.
Info re parents of George & Maria Can't help with parents & birth details of George, although on the 1841 he says he was not born Surrey but on the 1851 Maria's mother is listed as Ann Field, so that's part of the equation
1841 - St. George the Martyr, Kent Road ( mis-transcribed as SHILLITRE)
HO107/1085/3/27/6
George SHILLITRE 41 Fruit? (can't read the next word maybe merchant?) Not born Sry
Maria 41
George 15
William 13
Charles 9
Sophia 7
HENRY 5
Edwin 2
Maria & children all born Surrey
1851 - St. Peter Walworth, Newington. 6 Princes St? HO107/1567/752/31
Geo. J. Shillitoe head unm. 25 Journeyman carpenter b. Newington
Mary A. mother wid. 52 b. Horsleydown Sry
HENRY bro. unm 15 b. Newington
Ann FIELD g/mother wid 90 b.
? Sry?
In 1841 Ann Field, Maria's mother, is at St. George the Martyr, London Rd. St. Peters Hospital or fishmongers. HO107/1086/10/24/2
Ann Field 80 widow not born Surrey.
All the residents seem elderly & many are fishmongers
Hope that's of some help,
jane