Sororicide

[Mark Zuckerberg]

The murder of ones sister; also, one who murders or
kills ones own sister.

[Michiko]

The act of or [urge] to fully mudrer ones sister (older or younger) as she has a certain skill and manages to [nag], [belittle], and generally attempt to control your life as she does not understand that she is not in fact your mother.

[Julian]

The killing of one