@Laura6265 Why would you do this? Any discount would still leave you/them paying 15% to Airbnb. Why not just block the dates in the calendar and offer them the place by email. As a minimum you could offer them a 15% discount and you will make the same money.
I don't let friends and family book through Airbnb; I deal directly and block the calendar. Why would you want to pay Airbnb commission for that? Airbnb has no added value, then.
For distant friends/colleagues, I give a 25% discount. Very close friends get a 50% discount. After all, it is an investment I made with monthly costs.
If kids want to bring five friends, they only pay the cleaning fee and the cost of water and energy.
Except that Airbnb might consider renting to friends and family at a favourable price in exchange for a review as going against their terms since the review would not be impartial and biased by nature creating a conflict of interest and could get you sanctioned as per their review guidelines:
So whilst tempting, it is not without risk especially with the addition now of Artificial intelligence that Airbnb has invested in to monitor more closely hosts who do not adhere to their T & C.