The relationship between children and their parents, rooted in respect and awe, serves as the bedrock of human development. The incident in Noah's tent represents a profound loss of basic shame, planting the seeds of moral corruption that would eventually define the Canaanite nations [רש ר הירש].
The primary approach among commentators is that Ham did not commit a physical act, but rather failed a moral test. Upon finding his father exposed, instead of covering him with dignity, he chose to gaze at his disgrace and publicize it [רד״ק, שד״ל, בכור שור, ביאור יש״ר, קאסוטו]. Some suggest Ham was completely devoid of natural sensitivity, not even recognizing his behavior as sinful [העמק דבר]. However, a significant number of scholars understand the event differently, noting that biblical references to uncovering nakedness often imply forbidden sexual contact [מלבי״ם, הכתב והקבלה, שטיינזלץ, אם למקרא]. Because the narrative later mentions what Ham actually did, these commentators conclude that a severe physical violation took place, such as sodomy or castration [ספורנו, מזרחי, שפתי חכמים, גור אריה, רש״י, צאינה וראינה, רב סעדיה גאון]. The motive behind such a drastic act as castration may have been driven by greed. Having witnessed the deadly rivalry between Cain and Abel, Ham wanted to ensure Noah could not father a fourth son, thereby preventing further division of the world's inheritance [צאינה וראינה].
The narrative distinctly identifies Ham as the father of Canaan, a detail pointing to Canaan's active participation in the transgression. Canaan may have been the first to discover Noah and alert Ham, or he may have been the one to physically assault his grandfather while Ham stood by, failing to protest and even rejoicing [ספורנו, העמק דבר, צרור המור, ביאור יש״ר, רש״י, שטיינזלץ, ברכת אשר, קאסוטו]. This direct involvement explains why the subsequent curse was directed at Canaan rather than Ham. Furthermore, God had already bestowed a blessing upon Noah and his sons when they exited the Ark, and a divine blessing cannot be overridden by a curse [מזרחי, גור אריה, צאינה וראינה]. Additionally, there is a poetic justice in the punishment. Because Ham prevented Noah from having a fourth son, the curse struck Ham's own fourth son, Canaan [מזרחי, גור אריה].
The severity of Ham's actions is magnified by how he reported the event to his brothers outside. He did not merely mention it in passing. Instead, he provided a graphic, detailed, and continuous description [העמק דבר, רש ר הירש]. Ham spoke with arrogance, joy, and mockery, attempting to publicly humiliate his father and invite his brothers to join in the ridicule [ספורנו, רד״ק, שד״ל, הטור הארוך, מלבי״ם, ביאור יש״ר, קאסוטו]. According to some, he even boasted about his reasons for castrating Noah [חזקוני]. This dual sin, committed through the eye that inappropriately looked and the mouth that gleefully spoke, serves as the conceptual origin for the later biblical law granting freedom to a Canaanite slave if their master damages their eye or tooth [הדר זקנים, חזקוני]. In stark contrast to Ham's cruelty, Shem and Japheth chose to walk backward and respectfully cover their father. Through this act of deep reverence, they corrected their brother's moral failure and earned a lasting reward [צרור המור, צאינה וראינה].