Sister Bernadine Frieda, 91, spry and sharp, spends her days visiting the infirm with Sister Marie Kellner, 77, both of them onetime science teachers. Sister Marie, who left the classroom because of multiple sclerosis, reminds an astounded sister with Alzheimer’s that she was once a high school principal (“I was?!”) and sings “Peace Is Like a River” to the dying.

“We don’t let anyone go alone on the last journey,” Sister Marie said.

Seven priests moved here in old age, paying their own way, as does Father Shannon, who presides over funerals that are more about the celebratory “alleluia” than the glum “De Profundis.” But he has been with the sisters since he entered the priesthood, first as a professor at Nazareth College, founded by the order, and now as their chaplain. He shares with them the security of knowing he will not die among strangers who have nothing in common but age and infirmity.

“This is what our culture, our society, is starved for, to be rich in relationships,” Sister Mary Lou said. “This is what everyone should have.”