Genesis 9:24 - Joseph Benson’s Commentary on the Old and New Testaments

Noah knew Either by the information of his sons, or by divine inspiration, what his younger son, (Hebrews his son, הקשׂן, the younger, or little one,) had done unto him. Canaan is thought by many to be chiefly intended. 1st, Because the following curse is appropriated to him; and, 2d, Because the title of younger, little son, does not seem so properly added if Ham be meant, it not being probable that he was the youngest of Noah's sons; for when they are mentioned together, he is never named last, but always second. Be this as it may, it is very likely he partook of his father's sin, and probably first saw the situation which his grandfather was in, and told it to his father, who then told it to his brethren.