How to deal with CPS if you are a minor....?

My brothers friend was living with us up until a week ago. I am 16 hes 21. He was this wonderful brother figure to me. A little over a week ago i didnt want to go home because my parents were fighting. My friends parents called the police and I told the police that my parents were fighting and that my brothers friend had also thrown a chair in my room because he was upset. Later a social worker came to my school and told me that i said that he tried to get in the shower with me and have with me and when i said no he got mad and threw a chair. Even though I 100% denied these alligations the social worker came to my house and told my mom we were having . This guy has no other family and my family meant the world to him. My mom kicked him out because of the allegations and he is forced to live back with his father who hates him and vice versa because CPS is not allowing him to live with us. Everytime my mom or my brothers friend would call CPS and talk to the social worker or her supervisor they would bullshit through the conversation saying that they talked to tons of people who said we were indeed having and that they know we were having even though there is no evidence or proof of us having . I have been a wreck about this ever since it happened. My parents are telling me to give up because its a waste of time. I am planning making one final attempt at proving my point to this social worker. What do i say? What shouldn't I say? What are the chances of my brothers friend being able to come back and live with us?