Or just lie about also staying there. Say "yes, I will be staying there as primary customer", go there give the keys to your sister and that's the end of the st

Or just lie about also staying there. Say "yes, I will be staying there as primary customer", go there give the keys to your sister and that's the end of the story. Seriously, I am renting a place from you for 2-3 days for $1000, it's none of your goddamn business who's staying there. It's mine for 2-3 days to do as I please, as long as it's not trashed and neighbors don't complain.