A penny. (Heads and Tails. And Every Penny Has A Date On It.)
Jason. 1= January 4= April 9= September 10= October 11= November. The First Letter Of Each Month Ends Up Spelling Jason.
One of the men is a grandfather (father to other father) One is a father and one is a boy. (both sons and one father)
"If I were to ask the other guard which door leads to freedom, what would he say?" Then you choose the opposite one. Because if you ask the one that tells the truth, he would say the one that leads to death. The lying one will also say the one that leads to death, because he lies.