In a sense, yes. that's the problem with a "predestination paradox". There had to be a point of origin in the timelines where it hadn't happened. From a purely MC-centric focal point, though, he'll never actually know. Once you've jumped into the past and changed something, you can never get back to your original timeline, you're on an all new branch with deviations. Arguably, you may never be able to return even if you've only observed the past, because your original line ceases to be (for you) once you leave it. You can never see the future of your own timeline where you hadn't jumped back in time.
So, sure, originally your father may have been Steve Jobs, but after you jumped back in time and banged your mom on prom night when the two of them had their original fight, you're now your own father. But not necessarily the father of your current self. The new 'you' that gets born and grows up may be quite different.
For him (the new 'you'), however, he's always been effectively his own son, if his life follows the same path yours does. It's messy. Time travel is pretty much always a very messy concept when it comes to figuring things out. My own personal query on it is the matter of Matter itself. If I jump back in time, even if it's only a week, there's now one whole me of matter missing in the timeline I left, and extra matter in the universe/timeline where I've appeared. A hundred kilos of extra matter may not be a big deal on a universal scale, but who knows what effects it might have locally. Is there any form of quantum entanglement already going on? What happens to the "past" versions of those same molecules now that you've moved them back?