Strange Dream...Need help understanding it please

I had the strangest dream last night. My Grandmother has been dead since Mothers Day 1986. Well I dreamed she had this big house with lots of rooms and some really cool antique furniture. My real Mother (I was adopted but I know her) and I were at my Grandmothers house with some other family members an we were all cleaning my Grandmothers house. Dusting the cobwebs which were all over the place and I mean everywhere. Picked up a blanket and had to dust off cobwebs. She has been dead for 23 years so i don't understand the meaning of this does anyone have any insight as to what this dream may mean?
Thank you in advance for your help.
Debbie Tweet