It's best if your father or either your parents to be your sponsor and your cousin can be your co-sponsor. Its ideally better this as both either of your parents and your cousin will provid their bank statements(even if your father's account isn't too loaded but that of your cousin should be..) and letters of sponsorship were that of your father will state as the sponsor and your cousin as the co-sponsor showing is letter how much funds to be made available for your living expenses etc per month or annum
As if just your cousin act as your sponsor, the VO might not be convinced that you can complete your school without facing any financial restrain