Preists are all from Aaron’s family?

Exodus 40:13 says, “And thou shalt put upon Aaron the holy garments, and anoint him, and sanctify him; that he may minister unto me in the priest's office.

40:14 And thou shalt bring his sons, and clothe them with coats:

40:15 And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest's office: for their anointing shall surely be an everlasting priesthood throughout their generations.”  Is your local preist a son of the line of Aaron?  If you don’t think so then he must be a fraud.  Cast him out.  I don’t know how you could tell if he was or wasn’t though.  Do they carry a card of something?