See Brother, Sister. All are different parts of self. According to Freud, this is very often a symbol for genitals. Older siblings, according to Jung, point to more developed parts...
1. When a brother or sister shows up, it indicates unresolved conflicts with the person.2. Reflection of a good quality or qualities that one should incorporate in oneself. ...
Foreknowledge to avert the circumstances or accept them with grace; see “last”...