Elderly dementia client living in nursing home, working with his niece who is POA. The address used for his return up until now was his home, however house was sold in January of 2025. Client is in one state, but POA is in another state, so if I use the POAs address it doesn't look right when I file the state return since the mailing address state does not align.  Not sure what to list for address or what issues it will create - can you use 'c/o' in the address line?