@Yautja @Misticsan @HYBRID_BEING
It's set in a fictional world that operates on a system of nobility, where status and whom you have relationships with is very important.
It's based in a world, where these two nations have deep seeded hatred for each other, even in peace. Let's not forget this is based on Shakespeare's Romeo and Juliet, where two clans were in a blood feud. The relationship between Touwa and The West is not much different.
Leon's mother had to hide her face while living in Touwa, because she knew she would not be accepted by the Touwans, any more than her family would accept her marriage to a Touwan. Since the people of that neighborhood resented her presence there, why would they lift a finger to stop her from being hauled off?
If Leon's grandmother had enough political influence, I am sure the Touwan government allowed her in to kidnap her daughter, to keep their cease fire with the West. Also, again, why would the Touwans care that a Westian is being taken out of their country? They don't see her as a Touwan citizen. In fact, she may even be considered an illegal immigrant. I'm sure the Touwan government would have been just fine with a Westian being taken out of their country by her family in order to avoid any sort of diplomatic process if Leon's grandmother were to go to Westia's government and possibly even assert that her daughter was kidnapped by a Touwan.
Yes, this type of stuff has happened. Noble girls were often just married off to increase their family's standing, and they were given no say in who they married.
Heck even today in some countries run on Sharia law, girls are dragged out of the house of their husbands by their own fathers and brothers and killed in "honor killings", because they married or loved men who were not approved by their family.
I think the events in this are very believable based on the world that has been set up in the manga for 83 chapters. However, in this case, Leon should hate the Touwans as equally as she hates the Westians.