When you first posted about Emily's diet I thought about my house. I don't know how in the world I would do it either. I have thin ones that need to eat, average ones that don't over eat, and two that probably should be on diet food. I too free feed and I just don't have the energy to think about what life would be like if I tried to seperate things!! I have no suggestions but you definitly have my support and best wishes!!
Good Luck!!!