In Celtic mythology, Mag Mell ("plain of joy"), also called Tir na n-Og ("land of youth"), was the underworld. Unlike the underworld in most mythologies, Mag Mell was a pleasurable paradise, either an island or at the bottom of the ocean.
... under the age of 18 living with them, 67.6% are married couples living together, 11.5% have a female householder with no husband present, and 16.6% are non-families ...