A question about renting a house from a relative..?

My brother is about to rent his house out,as he is moving abroad. I have stayed at his house quite alot while he's been away on holiday,just to take care of the house.I even stayed there 3 weeks once while he was away. Even doing the cleaning (and trying not to make any marks on his beloved laminated flooring lol). Now i am hopefully goin to be renting his house.Does he need to make up a contract for me to sign?