Your guardian angel is the angel God assigned you to when you were conceived. It is an angel, not a family member who preceded you in death. If you want to have a relationship with your angel you can ask him to help you in your life and to get closer to God. Share your ideas with him and ask him to pray for you. You can ask him his name and he may tell you. I say ‘he’ but angels don’t have a gender since they are spirits, however an angel may wish to show itself or interact with you as masculine or feminine. It isn’t necessary to pray to your angel but I think it’s courteous to do so since angels are so concerned about us.