With so little info supplied this is the best i could find
Owen Gillan age 6 born Monaghan 1901 Census of 19 Lisnadarragh,Co Monaghan
Owen Gillan age 16 in 1911 at no 4 Lisnadarragh with parents and siblings.
Owen Gillin birth Oct Dec 1894 Carrickmacross vol 2 page 355
Possible marriage for parents
Michael Gillen Jan March 1888 Castleblayney vol 1 page 518 matches with 3 Catherines
Finlay,M'Caffery and M'Cudden.