What should have been one of the happiest moments of their lives turned into a brawl and resulted in one of the elderly women being charged with assault.
Police said that at first words were exchanged, and then fists, until the great-grandmothers were thrown out by security guards.
The astonishing dust-up happened at Heritage Valley Beaver Hospital in Pennsylvania, as the great-grandmothers waited for the arrival of their great-grandchildren.
Local news reported that 72-year-old Shirley Irvin – whose grandson is the father of the twins – was waiting in the maternity ward with Carole Alberts, the great grandmother of the woman giving birth.
Apparently, Irvin took offence when she overheard Alberts telling her daughter she was worried about her great grand babies.
Alberts told police that Irvin hit and shoved her in the upper part of her chest and arm, leaving a small mark on her arm.
Alberts' daughter intervened, then Irvin swung and punched her on the left side of her head knocking her cochlear hearing implant off her head and onto the floor.
Security guards asked all the women involved in the fight to leave the maternity ward. Irvin has now been charged with simple assault and harassment. Her preliminary hearing is scheduled for next week.