Brace yourselves -in true Targaryen tradition, Daenerys and Aegon (i.e. Jon Snow) could actually be siblings according to this new theory floating around that Dany's father is actually Rhaegar, and not Aerys as she was always led to believe.
Anyone think it plausible?
This isn't a new theory at all. R + L = D is one theory about Dany's past that's floated around for a while now. Here's Preston Jacobs talking about it in 2014:
https://www.youtube.com/watch?v=olUOUdlNvyg(Though Preston, at least at that time, thought that Dany was Rhaegar's child *instead* of Jon, not in addition to him.)
Whether this is what happens in the books though, I highly doubt this revelation will happen in the TV show. There's only so much time left, and it doesn't really add anything at this point.