HOUSTON (AP) — They quibble, joke and share knowing looks, finishing each other’s thoughts and making snide comments — like many sisters. But a recent heated argument was unlike any other they’ve had, and it ended in a most surprising way.

For months, 71-year-old Irma Myers-Santana and her younger sister, Anna Williamson, 69, had been debating who more urgently needed a lung transplant, each wanting the other to go first. Earlier this month, though, the sisters ended up in the same operating room, each getting one lung from the same donor in what doctors at Houston Methodist Hospital say is a first for their facility.