interesting! 1901 UK census

1901 UK census for Rotherham: 

Address would be 32 Millgate:

Listed are Tom Grady, Martin Grady, Harry Grady. Ages are wrong but I think the 'N.K.' means they were NOT present at the time the census was taken.

https://www.familyhistory.co.uk/census-abbreviations/

In the case of 'N.K.', the census taker was supposed to return to complete the info. Or, in this case, another person (different hand writing) crosses out the N.K. and perhaps puts guesses in for the ages. 

Note that gr-grandfather Thomas, grandfather Martin, and his brother Harry are NOT present in Ireland for the 1901 census (but John was). 

Also note that the 'head of household' is Jeremiah Kenny, also of Ireland. Need to research any connection to Kennys who lived nearby in Roscommon.

Is this them?