Do you have John's wife's name?
There is a John Gelling, age 39, labourer & shipyard worker, living in Barrow in 1901 at 27 Monk Street. He was born in Liverpool and his wife's name is Maria (probably Maria Doughty born Worcester) age 38. They have 6 children all born in Barrow:
Rachel 17
Isaac 15
Johnathan 12
William 9
Ruth 3
Herbert 1

The only Manx born John Gelling, I can find is a stone setter, (John R Gelling) a border age 21 living in Gorton at 162 Queen's Road. There is a Thomas K Gelling 22, also Manx born, at the same address.