Number of People

I made a reservation for February initially for 5 people but since then I have invited my brother and his gf to go with us. I wanted to add them to our reservation since the room allegedly can sleep up to 7 people comfortably. When I tried to add them to our reservation it’s charging me $100 extra for the 7th person. Is there any way I can get this fee waived? The room allegedly sleeps 7 comfortably so im not understanding why it’s charging me to add the 7th person. I was also wondering about parking, how does parking work if we take 2 cars?