Samuel Emory and Jane Cook Davis, genealogically speaking, were Generation I.
Jefferson Finis Davis (Generation II) was the youngest son of Samuel and Jane.
Generation III included the four sons and two daughters of Jefferson and Varina. All four sons and the youngest daughter all died, either very young, or unmarried.
Generation IV included the five children of Margaret Howell Davis and Joel Addison Hayes, Jr. Four of these five lived to marry and have prodigy.The fourth son, Jefferson changed his name to Hayes-Davis. Thus the Davis name continues today.
Generation V included Jefferson Hayes-Davis, Jr., Addison Hayes-Davis and Adele Hayes-Davis. Its amazing when you think about it, isn't it?