i remade them Story(Much more clearer than my young self): About when Leo was 3, when Alan was born, Leo developed feeling, apparently they were too strong, and because of that, if he's angry, he can cause terrible and unhinging chaos, since that, they gave him everyday pills that would neutralize his emotions, one day, they forgot to give him the pills, and his brother stole one of his blocks, just to play with it, making his tower of blocks fall over, making him angry, in a fit of rage, he ripped out his brother's heart, after hearing his parents cry, he came back to himself and realized the mistake he did, thus hanging himself, mourning for what he did, apparently he knew what death means, so he did, their parents were devastated.
/!\ WARNING /!\ The project may contain: Blood, Lore, (if you find more: etc.) I'll make a Q&A of Leo and Alan, and tomorrow, you guys can start questioning them, i'll be available at 14:00