I dreamed that my late grandmother was still alive, but the house was full of hipsters.

Fairy family interprets dreams for reference only. You may have a portrait or daily necessities left by your grandmother at home. These things seem to have been here for a long time. Another explanation may have something to do with what is provided at home. It's just that the dream you described is not detailed enough, lacking your own present situation and confusion, and you can only guess.