I had a question regarding MLK's speech "I have a dream", and the following quote more especially:
I have a dream that my four little children will not be judged by the colour of their skin but by the content of their character.
My question is, since he has four children, why not use the plural here ? Would it be possible, as in "the colour(s) of their car(s) ? And if that's so, where would the "s" be, would it be at the end of "colour/content" or "skin/character" ? If not, why ?