In the dream, the old lady (the grandmother of the person who had the operation I assumre) had come to my house (Inside the house or just greeted at the door?) and was handing over photos of her dead husband (She is holding on to something of her husband. In this cintext, probably some kind of spiritual connection) (I have never seen or me her husband when he was alive). It was like a person who was full of fire (consumed by a destructive force) and only his face was visible (Showing you an influence behind the scenes/face. This may be symbolic of judgement). I saw his spirit. It was scary (The image commumicated something spiritually to you). Then in that dream that lady was showing her husband's funeral photo to my mom (I think this is where the timing of the dream is significant & you obviously picked up on this when you warned your mother not to visit. ). I got scared, and I woke up from my dream and told my mom not to visit their home that day. Just before 5 minutes, my dad who was in another city, called home and told my mom not to go there. (Given what happened here, you consciously or unconsciously correctly interpreted the dream as a warning dream)
Sometimes my dead grandfather comes in my dreams. (I'd suggest you post in a separate threads as much detail as you can remember from the dreams)
Why do dead people appear in dreams? Does it indicate spiritual warfare, enemy attacking us?
It can be a number of things, the context of the dream & feelings you have can help determine this:
1. Your subconscious creating an image of them to symbolize something.
2. The Lord giving a dream or vision to symbolize something
3. Demonic/familiar spirits posing as them - this can be an overt attack or deceptive in nature to try & make people believe lies
4. The Lord allowing some kind of communication with the the person in their after-life (I haven't seen any cases where I am convinced this has occurred, but I wouldn't rule it out)
I know at least one person on this forum who believes it is only ever #3. But I believe it could be any of the 3 above & possibly the 4th, but I think for #4, the dream/vision would need a lot of other significant signs to indicate this.
Sometimes #1 & #2 can be so dramatic it can seem like a demonic entity.
Sometimes something we are doing or about to do can bring us into contact with a demonic spirit associated with what we are about to do. And I think it's often not easy to discern between the Lord showing an image that represents the demon as a warning vs experiencing something of the entity itself. I think your dream above is an example of this.
I think the bottom line tho is getting the message, which I think you did in the case of the dream you posted.
It would be interesting to hear your father's thoughts on why he gave the warning.
Is there anything from the lifestyle of this family that might ring warning bells - eg occult involvment, rebellion, manipulation, freemasonry, new age practices, firey temper/anger? Sometimes things which happen to our bodies/houses can be symbolic of things going on in our family's lives. eg grandson's eye surgery - needing help to see something.