how to sort out

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recently my younger sister ask me to help her to solve the problem going with her friends that ,two of her friends developed misunderstanding and not talking to each other ,and both of them sharetheir feeling,problems wid my sister ,but she is in dilemma that which side she should go,as she love both of them very much and do not want their relationship to get spoil ,as she is a teenager i do not find exact soultion to tell her ,pls some body guide