VINTON — The Birker family will celebrate birthdays of not one, but two of their children born on separate Leap Days.Gia Birker, 8, and her brother Owen Birker, 4, were both born on Leap Day, Feb. 29, four years apart, to parents Jeff and Leah.“I will never turn 80, and I will never get super old,” said Gia, who tells everyone she is turning two this year.Leap Day, Feb.