My son is seven, and when my niece had a sleepover recently, they played a game where they "licked and kissed" each other... I did not find out about this for several days when my sister called me to say that my niece told her. According to my son they were playingand he took off his shirt and one thing led to another... My sister is freaking out saying my son molested her daughter. While this is clearly inappropriate behavior, how serious is it?