Why is it that Owain and Lucina can't get married?

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So I was playing my Fire Emblem Awakening game recently and I finally got Lucina and Owain to get their S-class relationship (yes this is not my first time playing through the game) and I noticed for the first time that down where it lists the Character's supports (ex: Father, Mother, Child, Wife, Husband) they just have companion. Why can they not become Husband and Wife?
Best Answer
Since Lissa and Chrom are siblings, their kids can't get married; they're cousins.
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Are Owain and Lucina related?
Owain is the son of Lissa and the cousin of Lucina from the future.Fire Emblem Awakening - Owain \u0026 Lucina Support Conversations
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