A little bit of information that may interest you,
Mary Ann's brother named his son after Charles Marshall,
Bishopwearmouth cemetery
Charles Marshall Charlton,
aged 8 months,
buried November 26th 1886,
father John Robson Charlton, a green grocer,
abode 31 Cumberland St
place of burial ward 1 , section a, grave 3873
Durham records online, John Robson Charlton death,22 King Street, 1931 born circa 1863
this makes it so much easier to pin point the correct Charltons, in 1871, Cumberland St , Henry Charlton aged 30 a glass founder, born Newcastle Upon Tyne, his wife Elizabeth aged 30 born Sunderland, children John Robson aged 9, Mary Ann aged 7, both born Sunderland , in 1881 John R and Mary Ann are still with Dad Henry in Cumberland St .Mum Elizabeth died 1876 at Cumberland St,