I guess it’s obvious at this point. Jon Snow and The Dragon Queen will marry and unite the kingdoms so everyone lives happily ever after... or something like that.
Cercei will live till the very last episode then be killed. Her brother may live since they seem to be showing him as a reasonable person even he is incestuous. Then again; isn’t Jon Snow the son of a brother and sister? During the dream into the past the dying mom to the newborn Jon Snow called Ned Stark brother. Is he the father too?
No, Jon Snow is the son of Lyanna Stark and Prince Rhaegar Targaryen. That’s why there were two members of the Kingsguard wearing Targaryen insignia guarding the Tower of Joy.
No. Lyana Stark was either kidnapped, or ran away with, Rhaegar Targaryan. Jon Snow is their child. Ned Stark is Lyana's brother, and she was begging him to raise the child as his own because Robert Baratheon, who Lyana was betrothed to, would kill the child if he knew that Jon was a Targaryan. So, Jon is not Lyanna and Ned's child --- he is Lyanna and Rhaegar Targaryan's child.