How would you take this? Family problem?

[hun]

I have a ten year old son and he is at that age when the opposite sex becomes an issue. About two weeks ago we were at my uncles house who has a 8 year old daughter. My little cousin. My son had spent the night and I went to go pick him up. I was in the back yard with my uncle and only there about 20-30 min when my little cousin came out and told my Uncle that my son asked to see her private and was following her around and kept on asking. I was shocked and upset but waited till they went in the house to talk to my son about what had happened. He said that she was telling him she saw her friends little brothers private and thats how the conversation got started and he just said that he had never seen a girls. He said that he never directly asked to see hers. However, she is saying that he did. Me, my uncle and the two kids talked about what happened even though she still claimed he was asking her and he said that he didn't, i thought we brought it to the end.
This was 2 weeks ago. However, I recieved a call from my uncle today asking me not to bring My son to the family get together tomorrow cause it is at his house and he dosent want his daughter to feel uncomforatble. My feelings were hurt and thought it was kinda unfair. All my family is going to be thre. My mom, brothers and other cousins. Ive always taought my son to show my uncle and other family members with repect and now he is banning him from his house. Im not sure how I should feel about this.
22 minutes ago

I believe my son and think that my little cousin probably just felt wierd about the conversation they were having and got scared. I dont know,, but I believe my son. We told them that day that they should not be talking about that stuff anyway. Anyhow, I feel offended. I feel like I should call him back and defend my son more and tell him that its not fair to treat my son like that.
16 minutes ago

Should I call him back? I don't know what to exactly say though. We wil
Should I call him back? I don't know what to exactly say though. We will not go anyway, because we were already asked not to come but I want to tell him something, but I dont know what.
mifnitka - thanks for your response. I do have open converstions with my son. all the time. Like I said, we even talked about it the same day. This is why I believe him and think it is unfair that we are asked not to attend a family function cause of it.