It is best not to touch or sleep together.
It's definitely not good for a host family to share a room with others.
And don't let others sleep together in your house.
Let them sleep separately
It's best to sleep with one of them, so that they won't sleep together in the middle of the night.
The son-in-law of the girl who married before is also an outsider.
Unless the bride's family left you a house.
This case is another matter.