The 'Travis Translation' of Article 3, Section 3:
Treason, or betraying the United States, is making war against the United States, or being loyal to an enemy of the United States, or giving that enemy help or comfort. Nobody can be found guilty of treason unless two people describe the same obvious act of treason in open court, or unless the accused person says in open court that she/he did it.
Congress decides how to punish treason. If someone is guilty of treason, their family cannot be punished. The disgrace of the traitor, and any fines they owe, will go with them to their death, but not past that.