What okin means by this " The ambiguity is exacerbated by Rawls's statement that those free and equal moral persons in the original position who formulate the principles of justice are to be thought of not as "single individuals" but as "heads of families" or "representatives of families."'4 He says that it is not necessary to think of the parties as heads of families, but that he will generally do so. The reason he does this, he explains, is to ensure that each person in the original position cares about the well-being of some persons in the next generation" ?