Dear Confused, maybe,
Here is some information that might help you get back on track
1841 census
HO107/313/14 folio 53 page 20
Thornley
Queen Street
Robert Bowden, 35, Coal Miner, N [Not born in Co. Durham]
Margaret Bowdon, 40, N
John Bowdon, 11, N [asterick in occupation column might be coal miner]
Isabella Bowdon, 9, N
Jane Bowdon, 7, N
Ann Bowdon, 5, Y
Robert Bowdon, Y
1851 census
HO107/2398 folio 15 page 23
Township Monkwearmouth, Borough Sunderland
Mile Row
Robert Bowden, Head, Mar, 50, Coal miner, Northumberland Walls End?
Margaret Bowden, Wife, 52, Northumberland Walls End?
John Bowden, Son Unm, 20, Coal Miner, Northumberland Walls End?
Isabella Newton, Daur, Mar, 18, Northumberland Walls End?
Jane Bowden, Daur, Unm, 16 Northumberland Cramlington
Ann Bowden, Daur, 14, Durham Haswell
Robert Bowden, Son, 10, Durham Moorsley
Mary Bowden, Daur, 9, Durham Thornley
All of the Northumberland Walls End were ditto's of the first one and it is hard to read if it is Walls End or Wales End.
There is a marriage of a Robert Bowdon and Margaret Sanderson in Gateshead 28 Oct 1826.
Cramlington baptisms:
Jane Bowdon 6 April 1835 d/o Robert and Margaret
Wallsend baptism:
John Bowdon 23 July 1831 s/o Robert and Margaret
Kelloe St. Helen baptism
19 Sep 1841 Mary Bowden, of Thornley, 5th daughter of Robert Bowden (Pitman) & Margaret Sanderson
West Rainton baptism:
Robert Bowden two dates--9 Sept 1839 and 30 Oct 1839 s/o Robert and Margaret [there will probably be a notation on the parish record about this double entry
Sorry I couln't find Isabella baptism. I think the 1861 census if I have the right person--Isabella Newton wife of John was born Wallsend RG9/3748 folio 12 page 31.
There is a baptism of a Mary Ann Bowdon in Newcastle All Saints for 28 June 1828 d/o Robert and Margaret. That might be the first daughter making Mary the 5th daughter.
This information should help keep your thinking straight.
Janis