Irony of Patty's Religion
Anton assumes Patty is of German heritage because he observes that her last name, Bergen, is a "good German name" and also assumes, erroneously, that this is why she is open to helping him. Ironically Patty is Jewish, the group of people most persecuted and in danger from Hitler, which would make her the last person whom anyone would think prepared to aid a German soldier.
Irony of Patty's Father Being Protective
As news spreads that one of the German prisoners has escaped, Patty's father orders her to stay home as there is a highly dangerous criminal on the loose in town which is ironic because she is in far more physical danger in her own home at the hands of her brutal father than she ever would be at the hands of a stranger in a public place.
Irony of the Kindness of the Enemy
Nobody in Patty's family is particularly nice to her; her mother is spiteful and constantly pointing out all the flaws she sees in her daughter and never saying anything nice at all whilst her father is emotionally remote and physically violent. Even her little sister is only interested in what Patty can do for her and never does anything for Patty. Anton, meanwhile, is practically a stranger, is a prisoner of war and is essentially the enemy so it is ironic that the enemy is the nicest person towards Patty and puts her well-being ahead of his own in the way her family should but never would.
Irony of Patty's Father's Generosity
Patty's father is violent, abusive and treats her in the most terrible way yet when it comes to food he is incredibly generous and will not allow Sharon to be favored over Patty when it comes to how much money is spent on them. One family dinner at a steakhouse illustrates this when he suggested Patty try a better and more delicious cut of steak, which her mother objected was a waste of money. Her father insisted that whilst there was breath in his body Patty could have any food she wanted which is ironic because his willingness to be generous in feeding her body was the total opposite of his lack of generosity in feeding her spirit.
Irony of Patty's Father Feeling Unloved
After he has beaten Patty with a belt her father goes to the garage and talks to himself about how nobody loves him and nobody ever has which is ironic since Patty goes to great lengths to try to show him love and he rejects every nice thing that he does, emotionally and physically abusing her until it is he himself who has prevented her from loving him.
