Reincarnation
The Yoruba believe in reincarnation within the family. The names Babatunde (father returns), Yetunde (Mother returns), Babatunji (Father wakes once again) and Sotunde (The wise man returns) all offer vivid evidence of the Ifa concept of familial or lineal rebirth. There is no simple guarantee that your grandfather or great uncle will "come back" in the birth of your child, however.
Whenever the time arrives for a spirit to return to Earth (otherwise known as The Marketplace) through the conception of a new life in the direct bloodline of the family, one of the component entities of a person's being returns, while the other remains in Heaven (Ikole Orun). The spirit that returns does so in the form of a Guardian Ori. One's Guardian Ori, which is represented and contained in the crown of the head, represents not only the spirit and energy of one's previous blood relative, but the accumulated wisdom he or she has acquired through a myriad of lifetimes. This is not to be confused with one’s spiritual Ori, which contains personal destiny, but instead refers to the coming back to The Marketplace of one's personal blood Ori through one's new life and experiences. The Primary Ancestor (which should be identified in your Itefa) becomes - if you are aware and work with that specific energy - a “guide” for the individual throughout their lifetime. At the end of that life they return to their identical spirit self and merge into one, taking the additional knowledge gained from their experience with the individual as a form of payment.
Read more about this topic: Yoruba Mythology