mind problem

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I have 2 children 1 boy and 1 girl. Boy is 14 years and girl is 6 years.My son all of sudden without reason has stopped studying and going to school. I have asked him many times but no satisfactory answer. But by my talk with him I felt that he thinks we do not love him but love his sister. I do not want to psychologically destroy him. How to come out of this situation. Please advise.