Power of Attorney

Can a person grant power of attorney without court or notarization?
Can a person give power of attorney without going to court or signing papers in front of a notary?
Is a medical power of attorney valid if my brother moved to another state?
I had a power of attorney paper for my brother for his medical in ohio he moved to a different state do the paper work still stand in a different state
Can I delegate power of attorney to my son if my wife is disabled?
I wanna execute a power of attorney in favor of my wife. Can I add a provision to delegate that power to my son if she is disabled?
Can I give my three children equal power of attorney in New Jersey?
I wanna name my three children in a power of attorney of my estates in New Jersey. Can I execute a multiple power of attorney that gives them all equal power? What will be the legal effect if I add a provision that they have to act jointly?
Can a manager delegate business account management under a power of attorney?
My wife, who lives in New Jersey, executed a power of attorney so that one of her managers can manage her business accounts. This includes maintaining her finances and filing tax return. The manager delegated all those activities to an account management firm because he felt the tasks require special skills. Can he legally do that?