Gosh Steve
At that time of the morning I am just about ready to get up and start the day.... how on earth can you stay awake so long??
Not sure how much I will be able to find about the daughters, they are the hardest to track if they marry , obviously, but the boys should be okay.
I did get Samuel for you, so will keep on it for the others.
I have not been able to find a marriage for a Hannah/Ann GADD that fits yours, but that does not mean that she's not out there somewhere of course.
This may be James, interesting occupation in 1851

:-
GADD James and HOPKINS Anna Maria Married 27 August 1836 Newland Gloucestershire
1841 Census England Gloucestershire Newland
HO107/365/11/17
Lower Redbrook
GADD
James 30 Nailor No
Anna 20 Yes
James 1 Yes
Daughter Anna was next door with her HOPKINS grandparents.
GADD Anna 3 Yes
1851 Census England Gloucestershire Newland
HO107/2444/65/16
Lower Redbrook
GADD James Head Marr 40 Nailor and Local Preacher Oldswinford Worcestershire
Anna Maria Wife Marr 34 Newland Gloucestershire
Anna Maria Dau Unmarr 13 Newland Gloucestershire
James Son Unmarr 11 Newland Gloucestershire
Isiah Son Unmarr 8 Newland Gloucestershire
Hezekial John Son Unmarr 5 Newland Gloucestershire
Henrietta Jemima Dau Unmarr 2 Newland Gloucestershire
Sarah Mary Dau Unmarr 1mth Newland Gloucestershire
Edward WALKER Lodger Marr 56 Sawyer Ross Herefordshire
Elizabeth WALKER Lodger Marr 61 Raglan Monmouthshire
1861 Census Herefordshire Llangarren
RG9/1815/32/14
Langwoe ?
GADD
James Head Marr 50 Nailor and Local Methodist Preacher Worcester Old Swinford
Anna M Wife Marr 44 Gloucester Redbrook
Hezekial J Son Unmarr 14 Scholar Gloucester Redbrook
Henrietta Dau Unmarr 12 Scholar Gloucester Redbrook
Samuel W Son Unmarr 2 Hereford Llangrove
Think that's all for him
Probably Isiah :-
1841 Census England Worcestershire Old Swinford
HO107/1198/50/49
Stamber Hill
GADD
Isaiah 25 Nailor Yes
Mary 25 Yes
Rebecca 6 Yes
Ann 4 Yes
Mary 2 Yes
1851 Census England Staffordshire Wombourn
HO107/2017/372/17
Main Street
GADD Isiah Head Marr 37 Nailer Worcester Old Swinford
Mary Wife Marr 37 Nailor Worcester Old Swinford
Eli Son Unamrr 3 Worcester Old Swinford
Daughter Ann was visiting next door, in the household of Henry CARRIER. She was 14, a Nail Maker, born Worcester Old Swinford.
In 1851 Rebecca is in service in Stourbridge, aged 16, birthplace given as Stamber Mill.
In 1851 Mary is in Stamber Hill, Upper Swinford, living with Sarah HANCOCK, a widow. Mary is aged 12.
1861 Census England Staffordshire Wombourne
RG9/1986/9/14
Centre of Village
GADD
Isaiah Head Marr 47 Horse Nail Maker Worcester Old Swinford
Mary Wife Marr 47 Worcester Stourbridge
Eli Son Unmarr 15 Nailor Worcester Stourbridge
Levi Son Unmarr 7 Scholar Stafford Wombourne
1871 Census England Staffordshire Wombourne
RG10/2929/9/12
Village
GADD
Isaiah Head Marr 57 Nail Maker Worcester Old Swinford
Mary Wife Marr 57 Worcester Old Swinford
Eli Son Unmarr 23 Nail Maker Worcester Old Swinford
Levi Son Unmarr 16 Nail Maker Stafford Wombourne
That looks like it for Isaiah.
Karenlee