Our "home" addresses are linked between parent and student. When a student graduates, should the sharing link be broken? Should be keep the link and create a "college" address and make it primary?

I have about 31,000 constituents in the Raiser's Edge - we use it for our main contact database. I also have about 33,000 records in another address processing software where I store the names/addresses of people who receive our monthly newspaper. The records in the other software can overlap - may...