Nah, what is the problem with to be a youkai, and the rat clan was rotten, with a lot of blood in theirs hands, the sister sucks, she is worst what gramps, she can sacrifice enemies, friends, but not "family" her justice isnt justice, is only manipulated power@seekermoc
I wouldn't be surprised if all of that gets completely forgotten and all of a sudden big happy family. Until the rest of the rat clan kicks him out for being a youkai. (Probably the next arc)