Meditate for a few minutes.
Say: lord hades I ask thee to being my relatives spirit here
Sit there for a few minutes. If you feel you are being watched or listened to say: I ask of thee for the soul to be, my ex. Grandma I ask of thee to send the soul of (name of the relative).
Now if you feel a presence then it's worked! You are not done yet though.
Ask the relatives shade (spirit) to take the offering. After they have, they will ask you what you have called them for. Ask them to become the family lare (ancestral spirit).