John McGrath born 1856 in Clonmellon Co Westmeath

John McGrath was my great uncle born 1856 in Clonmellon Westmeath to Arthur McGrath and Catherine Gibney.He had 3 brothers, my grandfather Arthur being one.Brother William was born 1860 and died 1864. Brother James born 1854 and died 1864, there mother also died in 1864. John was shown as living with my grandfather in Clonmellon at the 1901 census but can't be found on the 1911 census. I checked all John Mc Grath's in Ireland at the 1911 census with no results. He was single at the 1901 census and shown as a dog handler. His father Arthur died in Clonmellon 1894 and John was present at his death.Any help would be appreciated. John McGrath.