Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing one's deceased father in a dream may indicate weakness and feebleness for the dreamer, or indicate goodness coming from him if he is happy, or his need for prayers if he is sad. His words are true.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Seeing one's deceased father alive indicates relief, joy, and fulfillment of a need. If he gives something, it is good; if he takes something, it is a loss.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Seeing one's deceased father is interpreted according to his state. If laughing, he is in bliss; if crying, he needs prayers and charity.