In the very first episode, Tyrion insults Jon by acting like he understands the plight of the bastard. Tyrion makes amends by saying, "All dwarfs are bastards in their fathers' eyes." But maybe Tywin treated Tyrion like a bastard because he really was one.

In the Season 3 premiere, Tyrion asks Tywin why he is not being made heir to the Lannister home of Casterly Rock. Tywin replies, "Men's laws give you the right to bear my name and display my colors since I cannot prove that you are not mine." While Tywin could becoming solely from a place of resentment, the line seems to indicate that Tywin is suspicious that he isn't Tyrion's father.

Yet again, Tywin might have given another clue about Tyrion's real paternity in the Season 3 finale. Tywin says he wanted to drown Tyrion after he was born since he was dwarf and Joanna died in childbirth. "Instead I let you live and I brought you up as my son," he says. Tywin does call Tyrion a Lannister in the moment, but if Tyrion was his biological son, why would he feel the need to say, "I brought you up as my son"?

With the help of his (half) brother Jaime, Tyrion escapes his fate of execution that his father had ordered in Season 4. After Tyrion discovers Shae in his father's bed, he finds Tywin on the toilet and shoots him with a crossbow. Afterward, Tywin states, "You're no son of mine." Tyrion replies, "I am your son. I have always been your son" and shoots him dead. Again, is this just rage at who Tyrion is or is there something more at play here?

On the way to meet Daenerys in Meereen, Tyrion tells Varys, "I will not be of any use to Daenerys Targaryen if I lose my mind." He uses this as a way to convince Varys that he should get some fresh air. But as Daenerys' father was the Mad King, a reference to his own insanity could be a clue that he's also Aerys II's son.

While traveling near Valyria as Jorah's captive, Tyrion quotes the history of the fallen city, which was the ancestral home of the Targaryens. "I suppose this is it, then. This is what remains," Tyrion says right before Drogon flies overheard. This moment seemingly occurs just to set up the first time Tyrion sees a dragon, but perhaps it was also foreshadowing that both Drogon and Tyrion are remnants of the Valyrians.

Once Daenerys and Tyrion meet, she has to decide if she should kill the Lannister. She tells him that killing him is probably her "safest option." He replies, "I can see why you would think so. It's what your father would have done." She then asks, "And what would your father do?" But maybe, just maybe, their fathers are one in the same.

Later, Tyrion adds, "House Targaryen is gone, not a single person who shares your blood is alive to support you." So it would be truly ironic if Tyrion was her half brother and said that in the very same episode that he officially starts supporting Daenerys.

"Home" gave the biggest boost to the Tyrion Targaryen theory. He successfully unshackled Dany's dragons Rhaegal and Viserion without getting burnt alive, which definitely seemed like a clue about Tyrion's true paternity. It's not anyone that can walk away from a dragon unscathed.

When Daenerys forms an alliance with the Greyjoys, Tyrion isn't pleased to see Theon. But he wisely tells the man formerly known as Reek, "It was complicated for you, I'm sure, growing up at Winterfell. Never quite knowing who you were. But then, we all live complicated lives, don't we?" It's a compassionate statement that doesn't let Theon off the hook for his past sins. But it could possibly be pertinent to Tyrion too since he might also have an uncertain identity.

Season 7 was way more concerned with getting viewers to the conclusion that Jon was a Targaryen, so the most recent season is lacking in Tyrion-focused hints. But when Jon wants to go to Dragonstone to meet with Tyrion and Daenerys, Yohn Royce tells him, "A Targaryen cannot be trusted, nor can a Lannister." And it just so happens that Tyrion could be both Targaryen and Lannister.

Book readers have been given more fuel for this family full of fire theory, so fans solely of the TV series are certainly scraping for evidence as the show comes to an end. But until Game Of Thrones is officially over, these episodes will keep the Tyrion Targaryen flame alive.