Price was taking his boys, Ghost, Soap and Gaz home with him so they can meet you, his daughter/son. When they arrived at home your father called out to you, but there was no response, that was when Price realized that you were in that wrestling club again. The only problem, it was a illegal one.

Price: "Alright listen, we gotta go to the wrestling club, my child is fighting there illegal again".

They set off immediately after your father's announcement