How far does our sense of justice go when we are faced with a condition of survival?
The answer seems easy, but marginalization can lead you to take a step further to destroy what you say you love.
In "Father Against Mother" the remnant of a fair and egalitarian society confronts the equality of survival alone, giving the "well-born" only the advantage of having less melanin than black people.
There is no class struggle, no order, no law. What makes one being superior to another is just the color of their skin and this can be a requirement to decide who lives another day and who will be eliminated.
"Father Against Mother" will simply lead the reader to make the wrong bet, or better yet, be left with no way out in the face of a trial.