These look like the two youngest in that 1901 census
Jessie Mooney, father Daniel Mooney, mother Jessie Duthie, born 22 April 1895 in Drogheda
Daniel Andrew Mooney, father Daniel Mooney, mother Jessie Duthie, born 14 September 1897 in Drogheda
Daniel Mooney and Jessie Duthie married in Dumbarton 1882. So that is indeed the right family in the census.
And the FindaGrave also matches.