The narrator implies that at age seven, what Ursula says to his father go right over his head—in mentioning contraception, she’s suggesting that she’s willing and able to have safe sex with the narrator’s father. However, even if the narrator doesn’t totally understand the implication, he does seem aware that their conversation has sinister implications for the narrator’s relationship with his father. If his father becomes sexually involved with Ursula, it’s even less likely that the narrator will find any sympathy from his parents.