I honestly think he was aware of how his sister was overshadowed by his existence as the man of the family. He knows about his sister's value and that she deserves all the recognition instead of him. He still views this world as the world of fantasy so he wants her out and make people realise of her capability in the "real" world. At least that's how i see it.
That could be a possibility, and I hope that it's the right one compared to the idea that I have about his wanting to show her capability. In all honesty, the reason for her family to be a b**ch to her is such BS, she really never deserved the treatment she received.
are you trying to use the brother is bad and didn't support her until now?! cause if you do you will have a fight! ╮(￣▽￣)╭
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Ok... so can we just talk about the MC's brother? I mean I get that he "loves" his sister (I guess) but I can't help but not overlook in the fact that he did say some shit about not letting her stay there in that other world because it would be a waste. Correct me if I'm wrong but, does that mean that he is doing all of this because he has some use for her in their "real" world? So if we do look into this... this shows that the brother will forcefully take her back into their "real" world to use her for the amazing idea's and high-fu**ing-IQ she has. So in conclusion of my random ass confused rant and theorizing, this brother is actually an a**hole who only looks out for opportunities that will help him in the future and sh*t?
(If I am wrong, or missed out on something please let me know, because this is really interesting to me as it adds to the plot s o m e w h a t)
Anyways, have a lovely day :D (๑•ㅂ•)و✧