Metta for dead father

During a meditation I have practiced Metta, as I have learned it, I sent Metta to; - myself - a good friend - a "neutral" person - a difficult person - all four of the above equally - and then gradually the entire universe with the thoughts; - May I be free from enmity/danger - May I be free from mental suffering - May I be free from physical suffering - May I take care of myself happily Sometime during the meditation I have also sent my Metta to my deceased father. I had a good feeling about it, but wonder whether a Suta this refers? I want to know whether this form is OK, and how to deal with it.