I dreamed that my father fought with others and became a vegetable.

Many times, dreams are the mapping of one's daily experiences and thoughts, but they are often the mapping of Zhang Guan Dai Li. For example, you may have seen others fight or participated in a fight at some time in the past, but you have seen a vegetative state or read relevant reports about a vegetative state on another unrelated occasion. In this way, it is entirely possible to mix unrelated things together in a dream and change the protagonist of things into another person.