[Cboldt]

"the father" is my guess too, and they'll accuse him of misprison of a felony, which is roughy what Trump is talking about when he says the government should act on people who see a crime, and facilitate hiding of the crime. Not exactly the same as being in on the conspiracy, more like being aware of it.

18 USC 4

Whoever, having knowledge of the actual commission of a felony cognizable by a court of the United States, conceals and does not as soon as possible make known the same to some judge or other person in civil or military authority under the United States, shall be fined under this title or imprisoned not more than three years, or both.

[rolling_stone]

possibly co-conspirator
misprision occurs after crime is committed.