Just a minor thought regarding Tyrion: He encouraged Danaerys to abandon Jon above the wall. I wonder if Tyrion, through his extensive reading, knows who Jon's parents are and is actively trying to remove Jon and his claim to the Iron Throne. It was his idea to bring back the undead, too, which was arguably a suicide mission.
I don't see where he would have read it. The only thing the book proves is that Rhaegar and Lyanna were married. It's to be seen if it says they had a child, and even then, it's unlikely his name is listed as Jon.
We've crossed paths before with characters who knew the truth about Rhaegar and Lyanna but it seems only Ned (and Meera's father?) knew anything about a child. If anyone suspects Jon is Lyanna's child, I'd think that person is Littlefinger. But even he has not shown near enough interest in Jon for that to be the case. With the right information, though, he may be the person to confirm it.
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