If you dreamed that your older sister disappeared: Do not be afraid to reveal your potential and ambition while realizing your plans, Excessive tensions can create health problems that you never expected. To see that your sister has disappeared in your dream may indicate that this person has a problem and you will soon be aware of this problem. The disappearance of your sister also indicates bad news, mourning in the household, and sad days. It is also seen as a harbinger that the person will feel lonely and bad.