Dreaming of grandparents symbolizes all of the encouragement that is instilled in you.
As a general rule grandparents are a symbol of, love, security, love, protection, love, home, and love. If you dram of searching for your grandparents you are really searching for love and protection.
There are no other interpretations for these. If you dream of being a grandparent you will have a happy domestic life with minimal problems.