I want to know the principles involved, and the logic behind them, before we talk about calculating backpay. Those should be stated and defended successfully b

I want to know the principles involved, and the logic behind them, before we talk about calculating backpay. Those should be stated and defended successfully before anything else. For example, there's examples (IIRC) of former slaves owning slaves themselves; how is that addressed? What moral principles are in play, which can be logically applied to figure out if such a person's progeny receive reparations?