A person who has killed a family member is often referred to as a "familicide" perpetrator. The term "familicide" describes the act of killing multiple family members, while an individual who kills a single family member may simply be called a "homicide offender." The specific legal terminology may vary based on jurisdiction and the circumstances of the crime.
what do you call the person who makes the main income in a family
call the police
The person is a blackmailer.
can you call someone a welth of knowledge
a person
A person?
You call that person a scholar.
A person who studies family ancestry is called a genealogist.
an ally
You would call them someone who peruses.
You can call someone who does not lie honest, truthful, trustworthy, or sincere.
someone who works for a business