Cost-benefit analysis is a weighing-scale approach to making business decisions: all the pluses (the benefits) are put on one side of the balance and all the minuses (the costs) are put on the other. Whichever weighs the heavier wins.
However, since the story constantly points out Jon's conflict with his illegitimacy and Ned's strict code of honor, many fans have come up with a theory that actually explains who they think Jon's parents really are. Fans know the theory as R+L=J.. R+L=J would refer to Jon Snow (J) being the child of Rhaegar Targaryen (R) and Ned Stark's sister, Lyanna Stark (L) rather than Jon being the illegitimate child of Ned.
How Are Jon Snow And Daenerys Related On 'Game Of Thrones'? He's Her Only Living Relative. It was six seasons in the making, but on Sunday's Season 6 finale of Game of Thrones, Jon Snow's mother was finally revealed. But part of the R+L=J theory points to Rhaegar Targaryen as Jon's birth father. That's right, he's a Targ, so how are Jon Snow and Daenerys related on Game of Thrones? Until now, the only other Targaryens we've seen on the show were Viserys, Dany's big brother, and Aemon Targaryen, who was both their great-uncle and the maester of the Night's Watch.