Well, you could call on your Ancestors and ask them to help make that happen. Their ancestors are your ancestors, so there is a lot of reason for them to want to help with your request.
You could go about it this way.
Tutorial: Petition Spells - New Magician Help & Introductions - Become A Living God
You could also just light a candle (or not) and just do something similar to a prayer where you ask the ancestors to help reunite you.
Regardless, you would likely benefit from using the mundane world to try to get their information that way, too. If you know their names, you could even try Facebook to reach out.