Dreams don't really have any meaning contrary to what others would have you think.
They are matters of the subconscious and no one can fully explain that, Anyone claiming to be able to do so is a charlatan.
The meaning of the dream depends on its emotional tone (fearful, happy, sentimental, etc.) as well as the content and context of the dream. For example, a dream about watching the sister drive away in a car would be very different from a dream of baking cookies together in granma's kitchen. Very generally, the dream expresses the dreamer's own feelings; it provides no information about the sister or her feelings.
maybe you miss your friend very much that why you had dream her/him
The question is too vague to provide a reliable interpretation. If the question refers to "having your sister" in a sexual sense, that would be a disturbing dream, but it is nothing to cause serious concern. It is only a sex dream, triggered by the dreamer's natural hormones. The "sister" in the dream is symbolic, merely representing an attractive female of whom the dreamer is fond. > The dream does suggest that the dreamer might need to make an effort to get to know other girls and broaden his horizons.
i'd laugh
You are worried about her, or have seen her die in real life (not dreams, visions etc.)
Dreams are about the dreamer. So the "sister" in this dream probably represents some part of the dreamer's own self that fears evil influence or temptation. The dreamer might be reluctant to admit to having such feelings or being personally vulnerable to temptation, so in the dream, the influence (demon possession) is projected onto the image of the sister.
Your sister in this dream represents yourself. The seizure and the big waves both symbolize the same thing: something unexpected, uncontrolable and overpowering is happening in your life that is disrupting everything else in your life.
Seeing oneself eating in a dream is neither good nor bad. It has no particular meaning unless something else is going on in the dream, such as receiving food from a cherished friend, or having food after starving for days, or some other dramatic event. The meaning of dreams, when there is any meaning, lies in the emotions evoked by those dreams.
Sister Sister - 1994 I Have a Dream 5-18 was released on: USA: 25 February 1998
It is very unlikely that your friends are having the same dream as you have. It is possible that your group shares common interests - let's say football - and so you all dream about football. But each individual's dream would be different and have a meaning specific to that person. Perhaps a better question to ask might be why your friends are telling you that they have the same dream as you have. It is possible that your friends are having a joke at your expense.
This dream suggests that the dreamer feels a sense of guilt concerning the sister. The dream is not predicting any future event.
There is no meaning to a pig in a dream.