When we begin to realize the contempt the brothers have against Hari started from their childhood, only brewing to become more severe in their adulthood, we'll see that there were reasons their "childish thinking" now takes on a different plane of abuse on the long run. Let's realize that they're all children right now too, apart from the emotionally and mentally mature Hari. Of course, we can't just simply brush off the abuse they've done before in the different timeline. But that's a different timeline, where they grew up with contempt. Here, there's a chance for a better relationship among them.