As the attorney-in-fact, you cannot delegate or transfer this power; only the grantor of the power (your father) could. If your father is not compentent to do so, then if he has a legal guardian, that person may do so--and if your father is no longer competent to manage his affairs, he should have a guardian. (If  he's not competent and has no guardian, you should speak with an elder law attorney about how to have one appointed.)