ANSWER:

Yes, because you are endorsing and approving of them sitting with one another while knowing they are non mahrams to one another!

QUESTION: When I go to my mother’s sister’s house with my family, they are all mahram to me.But there are non mahrams for my father,mother & sister.So what should I do when they all seat to eat together?As for me there are all mahrams in that house.Is it still free mixing for me?