Final answer:
The text provides limited information, suggesting that a character has become aware of something three months into high school but does not specify what action he started or what he disclosed to his parents.
Step-by-step explanation:
Three months into high school, it seems that the character in question has realized something about himself, as indicated by the dialogue snippet where the character shows a face like his father's and reluctantly admits to having known something for about three months.
The context does not provide details about what Craig started doing or what he told his parents specifically. This information would likely be found in a broader context of the narrative or text being discussed.