My son is not shy, makes friends easily and gets on with people. My friends son is one of his friends they get on great but introduce another child in the mix and my friends son can't cope. He gets upset and can't cope even though my son tries to include him in games with other children. My son is due to have his party soon with 15 friends from different clubs and school. None of them my friends son knows. He has already said he will have nobody to play with as he doesn't know anyone. He is the kind of kid who will meet people and get to know people over time. How can I help him to be happy and comfortable. He is a lovely kind, introverted child who I am concerned cope with new faces at the party.