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In the GoT finale, Sansa said that Bran couldn't father a child. And then, this fact was used by Tyrion Lannister to persuade Grey Worm that

this is what the dead Daenerys meant by breaking the wheel.

My question is: How could anyone know that Bran was infertile? Nobody had access to advanced technology to determine that and Westeros would definitely have seen crippled people fathering child.

marked as duplicate by TheLethalCarrot game-of-thrones May 21 at 8:46

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    Because he lost the use of his lower body and can't feel anything below the waist. For most people, that's where the genitals are. – Aegon May 21 at 7:42
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    @Aegon - Game of Thrown? – Valorum May 21 at 7:54
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    @Aegon The is no reason for paralysis to magically disable your genital. Sex is still very possible for paralyzed people. – Teleporting Goat May 21 at 7:56
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    @TeleportingGoat Had that discussion in an older answer. Can he sire Children despite his disability? Maybe. Do characters in universe think that's unlikely? Yes. – Aegon May 21 at 8:06
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    @Aegon - Not least because people would assume that any kids he had were the result of cuckoldry. – Valorum May 21 at 9:05

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