Christopher (Christy) Hogan

I'm hoping someone can help identify my Great Grandparents, the parents of Christopher (Christy)?Hogan of Limerick. Thank you. He appears to be either the son of Patrick & Ellen Hogan, as he identifies his Father as Patrick on his wedding certificate to Mary Purcell. Christy is called Stephen on the wedding cert! However I can track him on the 1901 census but he disappears on their 1911 census when he was about 12. Maybe he went to live with a relative. However there's another Christopher Stephen Hogan born in 1901 to John and Mary Hogan who is present in the 1901 and 1911 census.  I know from his army record that he was 26 in 1925. I also know about his colourful life, but what I can't establish is who are his parents or siblings? Any help would be appreciated. Kind regards, Tess