Note that it was "the nakedness of his father." If we let the Bible interpret this for us, we read in Leviticus 18:8 that this means his mother! But, we know that the curse fell on Canaan because he was the one who had done the action, Ham did not restrain him or discipline him, though. We should be able to imagine what Canaan did that disrupted the family structure there. If not, we can see the types of things that Canaanites were known for in Lev. 18 (see verse 24 and 25).
It is poor exigesis that claims a curse upon people of a certain physical characteristic is valid, when it is obvious who was cursed.
It is poor exigesis that claims a curse upon people of a certain physical characteristic is valid, when it is obvious who was cursed.