Although everyone who has seen the TV series "Game of Thrones" believes that all of the Targaryens are fireproof, actually this is a bit off.At the birth of the series, it is Daenerys Targaryen who could pass alive through flames, without scorching any part of her.
Curiously, George R.R. Martin has written in explanation of Daenerys surviving that last
Embers burning her out; he has also posed the question on occasion and simply not answered by invoking writerly fiat.