Your dad

Inexistent, gone, invisible, vacant, departed, MERELY THEORETICAL. Your father left before you were even conceived, he has no official record, legal, criminal, etc. No one has seen him at any point in time, those who have were erased off the face of the universe as soon as they laid eyes on this ghostly, hypothetical figure. If you know these people who have seen him you will forget about their existence. He isn't coming back.

Person 1: Hey is that your dad?
You: What? Where?
Person 1: (no response because they have evaporated)
You: Wait I don't have a dad or any friends.