Stephen and Timothy Quay ( ; born June 17, 1947) are American identical twin brothers better known as the Brothers Quay or Quay Brothers. They are influential stop-motion animators. They are also the recipients of the 1998 Drama Desk Award for Outstanding Set Design for their work on the play "The Chairs".
Stephen and Timothy Quay were born on the same day.
This is correct because they are identical twins with the same birthday. I think the system has a hard time making connections regarding dates.