(AGI) Vatican City, Sept 22 - Pope Francis is to celebrateGrandparents' Day, sponsored by the Pontifical Council for theFamily, on Sunday, Sept. 28. The celebration, in St. Peter'sSquare, will be attended by a number of elderly priests,announced the Office for Liturgical Celebrations. The ministry,led by Archbishop Vincenzo Paglia, will choose theconcelebrants. (AGI) . .