I got it from the articles that kept referencing his mother and her status, without mentioning his father at all. It sounded like they were no longer together, although I didn’t see that specifically stated. It it’s not true, that’s okay.
I believe I referenced earlier that I hadn’t studied this issue in full yet, so it shouldn’t really surprise you or anyone else that I might be incorrect on a point or two.
Your reference is incorrect. They were married and his Dad was temporarily working in the Canadian oilfields. His Dad was not yet a Naturalized citizen, although he was a previous “resident” of the US following his exile from Cuba.