Don't look for a yin-yang teacher in this situation. 1 It's not good for your father, it will only increase his pain. Mr. Feng Shui, who can connect Yin and Yang, is very rare. Even if they find him, I'm afraid they won't take the risk to find out the whereabouts of the world.
Let's find an orthodox temple to cross him over. It is best to do things within 49 days after his death, which will also increase his blessings.
The living can also do good deeds, set them free and give them back to him.
May your father live happily in the pure land. ...