Who is the oldest of Odessa Grady Clay's two sons?
Odessa Grady Clay: Odessa Lee Clay (née O'Grady; February 12, 1917 – August 20, 1994) was the mother of three-time World Heavyweight Champion Muhammad Ali and Rahman Ali, and the grandmother of Laila Ali. Rahman Ali:  He is the younger brother of the late Muhammad Ali.
Muhammad Ali