Hello Elwyn and King
Thank you very much for the extra information.
I found this yesterday "
In 1906 the Board of Education in Ireland made "Hygiene and Temperance " a compulsory subject in the public schools ." So Mary could have been a pupil at the school around that date.
I have had a look at the censuses - the Mary (William John's wife) who is aged 60 in the 1901 census - I agree, I don't think she fits as she is too old.
The 1911 census - This Mary (William's sister) might fit - but she would have been born in 1865, so if she was at the school until she was 11, she would have left in 1876, and the book hadn't been written by then.
I am not sure whether the school was Church of Ireland or Catholic - I shall contact them again and ask, as this would help (I think

) in finding the right family. I must also ask them what age was 5th standard!
Thank you VERY much again for your help
Tilly