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.

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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 '19 at 7:42
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    @Aegon - Game of Thrown? – Valorum May 21 '19 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 '19 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 '19 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 '19 at 9:05

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