Just to be clear on what a Grandparent is: Grandparents are the parents of a person's father or mother - paternal or maternal. Every sexually-reproducing creature who is not a genetic chimera has a maximum of four genetic grandparents, eight genetic great-grandparents, sixteen days great-great-grandparents, etc., though the numbers can be lower due to pedigree collapse. <Wikipedia> Now that we are clear: The definition is provided to give you an idea of how important it is to interview your Grandparent(s). It is a bonus if your Great Grandparent is still alive. He/She may have a wealth of information to share with you, so do your project a favor and contact your Grandparents and set each one of them up for an interview.
Because Grandparents are up in the age, you may run the risk of them not remembering events correctly. It may be best to have their child present to assist in their parents' comprehension of some of the questions asked.
We provide an extensive interview list for you to ask your Grandparents all the right questions for your GriotBook. This interview checklist can be found in the Family Historian Center and the Authorized Griot Center. Now, Have fun interviewing your Grandparents.