Confounding terminology - 'Personal Representative' and address aspects.

Apparently, 'Personal Representative' can have different meanings, one referring to court-appointed and one not?  It's also confusing as to whether or not a family member should put their address on a deceased's final 1040 so that in theory any future correspondance intended for the decedent goes to the family member's address. Is a family member within their right to do so and would the return be processed - or rather cause problems (especially if the decedent had the same filing address for decades). 

 

Feedback from anyone having first-hand experience would be appreciated.