“I don’t like Chrom/Robin as a married couple because I don’t understand why Lucina and Morgan can both use Falchion having Grima’s blood. For a sword that is supposed to be so picky that doesn’t make any sense.”
//Probably because they also have the blood of the Exalt? And that Lucina travelled back through time to save the world from Grima. Just because they have Grima’s blood doesn’t meant they’re unworthy.