Tyrion Lannister: If we marry them, they could rule together.

Varys: She's his aunt.

Tyrion Lannister: That never stopped a Targaryen before.

Varys: No, but Jon grew up in Winterfell. Is marrying your aunt common in the North? You know our queen better than I do. Do you think she wants to share the throne? She does not like to have her authority questioned.