Rheagar was the Mad King's son. Tyrion would be Danny's uncle.
From wiki:
Prince Rhaegar Targaryen is an unseen character inGame of Thrones. He is deceased when the events of the series commence. He was the elder son and heir of KingAerys II Targaryen, holding the title of Prince of Dragonstone. Rhaegar was the older brother of Viserys andDaenerys, though Daenerys was born after he died. He was the last great champion of House Targaryen.
So...I was wrong about Danny being Rhaegar's daughter. They were brother-sister. So, Tyrion would be a half-brother. Jon Snow would be her nephew.
Jon maybe changed by his resurrection though. Might not be the same Jon.
I think that's a safe assumption. Both Lady Stoneheart and Berric have changed by being brought back. I'll point out its a bit funny a guy named "Jon Snow" was resurrected via a supposed god of fire.
I disagree. I don't think those characters were really changed when they came back. The only thing different was that they lacked a few memories. Well, Lady Stoneheart was crazier and wanting vengeance, but that's not really against Catlyn's character, either.
And I was thinking Danny was Rheagars daughter... been awhile since it's come to mind.