To dream that someone is being cremated indicates that you seek excellence in all aspects of your life. It also symbolizes virtue, cleanliness, and innocence.
Dreams of a cremation represent completion and the end of a cycle. Perhaps you are coming to accept ashes to ashes, dust to dust, and the temporal nature of life. You are realizing the ego diminishes to dust in the light of the fire of transformation and only that, which is real remains.