Dream about killing grandfather points at conflict and aggression. You are not being cooperative. You are lacking in a particular nutrient. This dream states failure in some personal endeavor or a setback in some ideal you had. You do not have all the facts needed to make an informed decision.
Killing grandfather dream refers to someone in your life who exhibits some qualities that you liked. You may not be making yourself clear to others. You are selling yourself short. The dream is a trilogy, as in the past, present and future or father, mother and child or body, mind and soul, etc. Perhaps you feel that you are going around in a circle or that you are stuck with a decision that needs to be made.
If you dreamt about killing grandfather:
Upheavals within a group with which you’re affiliated, perhaps professionally, might cause you to alter your goals slightly. In the long run, this could well prove to be a positive development, although the conditions leading to it could be a bit disconcerting. Think of this as an opportunity to pursue new hopes and dreams that you may not have considered before. Plan carefully and then go for the gold.