How blessed you are to have them coming. My thoughts are do what you can with any help you can get that understands how you feel and understands the situation. Maybe your Mom would love helping to get it all organized and feel it will be more hers too if she has that opportunity. You Dad also would probably feel the same way. Even if physically they can't do a lot, I'm sure that they would enjoy throwing out ideas and plans that would suit everyone. Since everyone will be living together....everyone needs to feel it's their home and space. Since you're so happy they're coming make it wonderful for all and not overwhelming. Life has a way of working out in all kinds of situations and it looks like the hardest part (families living together) is no problem at all. Thoughts and prayers to you.