@Bahsuo
Yeah, it's not....
That tag shouldn't be there based on every other situation like this I've seen in other series on this site.
In those the tag is only used for blood relations, if not blood related I've seen it removed--even when it wasn't made clear for quite a few chapters.
Given how quick this apparently says that isn't the case, I'm pretty sure it should be removed.
@WeeBDestroyer
when they say twins you would be sure that they can't pull the bullshit they aren't actually related since they have to had the same birthday at least and relatively a similar look but they still did it