For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
Kelebogile Nkau
Ancestors are dead people and the Bible strictly prohibits people from making contact with the dead. Any so called contact is actually contact with demons. There is a passage in the Bible that states that the dead do not see anything under the sun. This can also be said of the popular belief that someone who died is a guardian angel. This is completely false. Angels are beings created by God to be specifically that: angels.