Goodbye house?

Yesterday, my Mum told me she plans to sell our family home. I don't know why, but I cried when I heard the news. For some reason I felt sad, even let down. I guess I was comforted in knowing that a part of my life remained intact, while everything else in my life seems so fickle. A normal reaction, I suppose, to think that a piece of (my) history will be gone forever.