The answer doesn't have to be one fit for all. It may depend on other factors not mentioned in the question. For example, if the parents are already very old, with degenerative diseases, and no longer have the capacity to survive on their own, then sacrificing their children to extend their declining lives doesn't seem to be wise.Which one is better: Someone sacrificing themself to save their parent, or someone sacrificing themself to save their children? What's the reason?This is a very interesting question. My answer to this is actually a reversal as I love my wife and son so much and my first priority is to protect them if I was to die I could not carry out this priority so my answer may sound selfish but I would rather free them first of this dangerous world or at the very least see my son grow to an age where he can protect himself.