My step-sister has a son age 8 and my son is 3 1/2. Her son has always been a problem child. He can be aggressive and mean to my child. My husband does not trust the boy and keeps a close eye on them fearing that he will physically hurt our child. This weekend we had a traumatic incident while on an overnight stay at a hotel with myself, my sister and the two boys. They were playing and then they got quiet and we noticed that the bathroom door was closed. We hollered at them and my 3 yr old came out with underwear twisted. I asked him what they were doing and he said, "He pulled my underwear down and stuck his weewee in my booty". I asked him to repeat it. He said the same thing. My sister yelled at her son and asked if it was true and he said yes.She lost it and started hollering at him and spanking him. She asked him where he learned this and he said he learned it from his older step-brother but wouldn't say when. I don't know exactly what occured to my child because all questioning of the boy came to a hault as soon as he said he learned it from his older step-brother and he was no longer in trouble for doing it to my child. The older boy is 13 now and is denying anything ever happened. My sister just keeps saying that it's normal for boys to play around and what her son did to my son wasn't sexual but what the older boy did to her son was sexual. While I believe that it is normal for kids of a certain age to show privates and maybe touch, I don't think simulating a sex act is normal. And I don't believe that an 8 yr old doing it to a 3 yr old is normal. Shouldn't an 8 year old know better at this point? I did talk to my child right after the situation about what is appropriate and not appropriate touching, etc. Now that we are back home, should we leave it alone in hopes that he won't remember or should we go over it again and find out exactly what happened and talk more about what's appropriate and not appropriate behavior? Any advice is appreciated.