1901 British Census
Is there any way to find out what the correction codes made by the enumerators in the 1901 British Census mean?
Referring to "Evelyn A Sheldrick." Age says 1 in the original but there seems to be a correction code (9) and another (21). Evelyn is male, single but I believe he might be the son of Percy, directly above his entry. The mother Elizabeth was widowed in 1875 and was 54 in this census, most unlikely to be the mother of Evelyn. (And Evelyn was a male name in the 19th century)
Your help is most appreciated.