Cousin 13yrs old fractured neck femur surgery done with two screws no blood supply on bone scan will he ever walk again? What solutions does he have?

Yes. Yes, he can absolutely walk again. The question is at this point whether or not he has developed avascular necrosis, and based upon that what should be done. If he does have avn, treatment is based upon the stage it is currently at. Make sure you are seeing a specialist in that area.