It may be that the parents are having marriage problems & really dont want others outside the immediate family to know what is going in & they have a hard timebdealing with each other & they are uncomfortable trying to put on a front while compant is there. Only reason I say that is because thatvwas what my marriage was like & it wasnt easy when our daughter invited friends over. We were civil but it took work & have no idea if hervfriends sensed it ir not