Why is Dora's boyfriend her cousin?

I'm curious to understand the context behind this statement, "Why is Dora's boyfriend her cousin?" It seems like an unusual situation, given that typically, romantic partners are not also related by blood. Could you elaborate on the circumstances that led to this relationship? Is there a specific cultural or familial tradition that allows or encourages such a union? Or is there some other explanation for this seemingly paradoxical arrangement? I'm genuinely intrigued and would love to hear more.