
If you know Game of Thrones, then you know Jon Snow. He's the Bastard of Winterfell. In both the books and the HBO show, he's one of the main characters in a cast of seemingly thousands. He's almost certainly the secret Targaryen heir to the Iron Throne. And I have to say, as an irritating book person who loves to point out all the things that the show gets wrong... TV Jon and book Jon are not all that different. Book Jon is also serious, well-meaning, and very, very pretty.
If
 I have to split hairs, though, the main differences are that 1) the TV 
show is way ahead in the timeline, and therefore Jon is now a sadboy 
zombie who wants to bang his aunt and 2) in the books, Jon Snow forces a
 woman to give up her baby.
Or, at least he forces her to switch 
babies with the wildling "princess" he's crushing on, in order to save 
one baby from being burned at the stake. It's a whole thing.
In 
both the book and the show, you see, Jon's BFF Sam hits it off with a 
young woman named Gilly. She's a wildling, one of Craster's 
daughter-wives, and she's pregnant. She's terrified that she'll have a 
boy, and that Craster will sacrifice him to the White Walkers, because 
that's Craster's favorite thing to do.
So after Gilly has her 
baby, she escapes with Sam and makes it down to Castle Black, after 
fighting through some zombie hordes and bumping into Bran Stark on his 
way to go turn into a tree.
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Meanwhile,
 Mance Rayder, the King Beyond the Wall, is attacking Castle Black with 
his free folk warriors. Mance is in the show as well as the book, but 
book Mance also has a wife, Dalla, and a super hot sister-in-law, Val.
Dalla
 dies giving birth to Mance's baby during the battle, though. With the 
help of Killjoy Stannis and his knights, the Night's Watch wins the day 
and takes Mance, baby Mance, and Val as prisoners. The baby is then 
given to Gilly to nurse, since the Night's Watch is pretty short on 
infant formula. So now Gilly has two babies: her own kid, nicknamed Monster, and Mance Rayder's unnamed son.
There's a whole lot of other political nonsense at play here — 
Stannis has Mance Rayder burned at the stake, but it's not really Mance 
Rayder, the Lady Melisandre has simply disguised someone else to look like Mance,
 and Mance is still alive. All the Night's Watch guys consider Val a 
wildling princess, and Stannis wants to marry her to Jon Snow to 
consolidate power. Jon likes Val, but also he's too damn honorable and 
angsty to give up his post in the Night's Watch for anyone, no matter how hot.
So Jon's stuck as Lord Commander of the Night's Watch, while trying 
to maintain Night's Watch neutrality during the Westerosi Civil War, 
trying to rescue his little sister from Ramsay Bolton, and trying to 
save all of humanity from the coming army of snow zombies. With all of 
that on his plate, though, he also has to try and make sure that 
Melisandre doesn't up and kill a baby right under his nose.
The
 "Red Woman" Melisandre isn't above murdering people to help Stannis get
 ahead in life, after all. She's always going on about the power of 
king's blood as a sacrifice to her fire god. In the show, she's already 
burned Stannis's daughter alive as part of a spell to make snow melt. In
 the books, Jon is worried that she might try to sacrifice Maester 
Aemon, the elderly Targaryen maester to the Night's Watch, since he's 
the son of a king of Westeros. Or she might go for Mance Rayder's wee baby, who's the son of the King Beyond the Wall.
Jon's solution? Send Sam to grad school.
Maester
 Aemon is declining rapidly, so Jon decides to send Sam to train at the 
Citadel and become the new maester for the Night's Watch. He sends 
Maester Aemon and Gilly with Sam, claiming it's too dangerous for them 
at the Wall. But first, he takes Gilly aside and tells her that she has 
to give up her own baby, and take Mance's baby instead.
Gilly
 wants to take both babies with her, but Jon tells her that if she 
doesn't do as he says, and Melisandre sacrifices Mance's baby, Jon is 
going to kill Gilly's baby as well. 
Yikes, Jon.
Poor Gilly is forced to take Mance's baby with her and Sam as they 
voyage to Oldtown, and leave her own baby at Castle Black. She spends 
almost the whole trip grieving her child. It's only once Maester Aemon 
dies and Gilly and Sam have a spontaneous grief hook up that she starts 
to recover. She accepts her situation, and gives Mance's baby the peak 
fantasy name of Aemon Steelsong.
It's a tangled mess for everyone 
involved (except for maybe Sam, who's just trying to go to grad school).
 We can only guess what GRRM has in store for these two unfortunate 
wildling babies. But one thing is clear: Jon is being forced to grow up real fast.
Like his "father" Ned Stark before him, Jon is choosing to lie about a
 baby's identity in order to try and save him from death. That's noble 
in intent—but forcing a crying Gilly to give up her baby, and 
threatening to kill poor baby Monster is far from Jon Snow's 
best management strategy. He is trying his level best to live by his 
code of honor... but his choices grow increasingly cruel.
 
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