Patricia, are they just staying the one day? Deep Breaths! Maybe you can plan snacks and some entertainments? Do they like to play cards or board games? Are there some local scenaries they might like view? Take a can ride? If things get tense can you find an excuse to get out of the house? Run to the grocery store? Go comfort a friend?
It will be OK. you will get through it. having a plan helps.
Love from Lenina