Worried about my younger Brother!!!!

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I am so worried about my younger brother, what actually happened that, few months before one of my friend use to come at my home for group study, she use to come daily for around two months, and every day after studies , we three of us , me that frnd and my brother use to play some indoor games. Now the situation has arised that my brother has fallen for that frnd of mine and every day he useto urge me to convey her about his feelings but i am so scared, how could it be possible , he is three year elder to my brother. Can any one pls help me in this regard , what should i do??