It makes me sad for all of us that we have to do this so early but I totally commend you for being proactive!
I come from a long line of planners aka control freaks, my great Grandmother put masking tape on the back of everything with the person's name she wanted to have it although I think she waited until she was a little wifty because some of it like 3 chairs to one person and the 4th to another didn't make good sense but we worked it out. My mother is in the process now of organizing and downsizing.
Of course my reply wouldn't be complete until I suggested selling some things on either craigs list, ebay or having a yard sale.