To dream of the sister, reflects the bond you have with your sister. The dream may indicate how close or apart you are with your siblings. If in your waking life you do not have a sister, then the dream may be an indication of your loneliness, where you have no one to talk to or cry the shoulder on. The dream about sister could also be related to the dream of the nun. In this case the dreamer has serious issues with the spirituality and beliefs has made.