R + L = J or N + A = J
So which one do you subscribe to?
R + L = J (Rhaegar + Lyanna = Jon)
N + A = J ( Ned + Ashara = Jon)
Make sure to state your reasons why!
Starting around 1:58
GRRM: "Who was Jon Snow's mother?"
Weiss: Our answer was right.
Then Kimmel gets further confirmation that the mother is the same in the show and the books.
Therefore, Lyanna is confirmed. Deniers can still make all kinds of useless theories about the father, but not the mother. Or they could simply do something useful with their lives.