Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
Treason isn’t flipping off the President or even hanging him in effigy. It is either an overt act of war, or aiding government who are directly in a state of war with the United States of America. Being against a war isn’t treason.
The Congress shall have Power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted.
If you are convicted of treason, Congress decides on your punishment. Historically, this has been anything from a prison sentence to execution. Some people who were convicted of treason have had Presidential pardons.
However, if you are convicted of treason, your children cannot be punished for your crime and conviction. It might sound strange, but in Tudor times, if you were convicted of treason and were a peer of the realm, your title died, your oldest son could not inherit and your estates were forfeit to the Crown.