Kamurai
Awful watch, won't watch and can't recommend, even for younger audiences.
The best thing about this movie is how awful the villain is, it's like if Van Helsing was a jerk and vampires were all nice.
The sister is at least interesting, wrestling between cultures, but that is immediately trumped by child vampires. One of the most horrific versions of vampires is trapping someone in a 13 year old body for centuries, and they play it off as a laugh, as if he is 13.
In some versions, vampires are biological enough that they birth, giving a "pure" blood line ("Blade"), or can mate with humans under the right conditions, but either that is a Dampir or a human. It is VERY unclear what is happening here so I'm left with this clan regularl...