28 July 1906 - John the musician was in the prisoners' book in Kingstown (Dun Laoghaire) charged with 'tendering a base half crown'. He was acquitted on 1st August 1906.
On 29 September 1913, he appears again in the register, listed as John Clarke or McCormack, musician, this time in the Bridewell station and charged with abandoning his children. He was cautioned on 1st October 1913.
DMP prisoners books:
https://digital.ucd.ie/view/ucdlib:43945 and
https://digital.ucd.ie/view/ucdlib:43947Catherine and the children appear in the workhouse records quite a lot, sometimes when John would be in prison. Looks like the family didn't have it easy.
Find My Past have the Dublin workhouse records. The workhouse was for those in need, but also as a cheap hospital for the poor.