Dorothy and Rose moved in...
I think this may have been said on the IMDb board, but when Dorothy and Rose (Sophia, too) moved into Blanche's house all they had were a few boxes. You would think people their age would have accumulated furniture, dishes and various items, but they only had a few boxes.
Obviously there would have been no place to put it in Blanche's house, but I don't remember them ever explaining it like saying, "My dining set went to my daughter. My bedroom set went to my son." No doubt this really happens because I have an aunt who moved to California when she was about 50 to be near her daughters and she now lives in a small apartment, so she would not have been able to load up everything in her house and move it across the country into a small apartment. Even though I'm not totally sure, but I think some of it she gave away, some things she threw away and other things ended up with her daughters since they have houses and children.