I have a DS aged 4, is in preschool and has mixed well with lots of different children in his class, however now seems to have settled with the most disruptive child in the class, he is loud and his speech is poor. I am actually quite fond of this other child but hate the influence he has on my DS, who has been very bright, happily calm and eloquent up until this friendship. I'm not overly concerned, but wonder if any parents of older children have any thoughts on how much a parent can influence who your child is friends with as they begin school and also begin to choose their own friends?