5 Answers

If the sheets have been used wash them... if no one has used the sheets then leave the bed alone.  No need to clean something that is clean.

Wash them after your guest leaves, they are fine in the meanwhile.......

Absolutely!  Every time you are expecting a house guest wash the sheets and make the room fresh.

If these sheets ahve been used or any of the bedding please wash them I would hate to sleep in a bed that has been slept in by someone else and make the room clean and fresh and nice for your cousin you will better by doing this and put some fresh flowers in vase this will look like you have made a effort

Funny, I have never thought to ask someone if they washed my sheets before I arrived. I believe that would be rude.