At this point, I feel like I shouldn’t need to say “Spoilers” because if you clicked on this link and haven’t seen the finale, you deserve whatever spoilers you see.
It’s pretty obvious at this point who Jon Snow’s father really is. The show writers did not explicitly say, but very heavily implied that Jon is the son of Lyanna Stark and Rhaegar Targaryen. Most likely, Rhaegar did not kidnap Lyanna. She willingly ran away with him and the two were married in secret, making Jon the heir to the Iron Throne. This is why there were King’s Guard guarding the tower. They were guarding their new king.
Ask Siri about Jon Snow’s father and she’ll give you a couple cryptic answers. This isn’t the first time Siri has had funny responses relating to Jon Snow. Looks like Siri is just a big fan of the show.