No, unless it is stated otherwise on the notarized document. In cases of power of attorney all POA's become null and void upon the death of the grantor regardless of how the POA was implemented.
it don't really expire but he can spoil
No, it won't expire. They will cancel it when the couple lawfully (i.e. approved by the court) get a divorce.
Yes. Search warrants have expiration dates.
No you can not you have to get another webkinz and sign it into your expired accout to play it again.