from what i understand, you have to show proof that you arrived in the US before the age of 16. whether that be by school records, or medical records, etc.....
then you must prove that you have been in the US since 2007.
however, if you have an I-94, which you might because of how your father came to the US, then you will need to send a copy of that as well.
as far as proving that you've been here since you were 4, i dont understand the need for that.