Well 2 things
who to save
the cost.
first the who to save part:
your wife, your kids, your brothers, your parents.
1) kids
You can always have other kids, but they are you legacy... so with this regards, it is worth saving your kids once they have started to develop a real personality... say 2 - 3 years old? They are not really a person before that age and their survival is likely dependent on your presence anyways.
Definitely choose your wife over your infant at the hospital... you don't have any affective link to the infant...
For your 10 year old son or daughter.... definitely do what you can.
2) parents and siblings
you won't get much more of these, but their path is different than yours... it is really a personnal choice, but in no way is your sister's life more valuable than yours, so you have to weigh everything. And don't forget that attempting to save someone doesn't mean you succeed, so giving up your life is just dumb here.
3) your wife
Well... how much do you love her?
Don't give up your life as there is always the risk that you fail to save her and then your kids are orphans.
Loosing a limb or something depends on your attachement for the person.... Though if you divorce 2 months later you'll surely regret it...
Now the cost:
1) Possesions... why not? you could even do that for your neighboor, this is no big loss.
2) Body parts... well you need 1 eye and try to keep your arms and hands, the rest is not essential. But you have to make sure your life is not put in danger... like don't give a lung or whatever the future makes possible. Even for your kids there you have to weigh things... I mean if they are in that bad a shape that they need a piece of your body, you're probably only giving them a few years at most... not worth a life.
3) Sex.... that means cohertion... then prefer killing the threat than sleeping with someone... cause if you are coherced into this it means that there is no moral barrier to killing the person anyways... and most likely self defence applies ....
if its for money to pay health care... then that's different... you might do it but be carefull.
4) Own life... really your choice but I find it valid only for your kids and as I said before if they are not infants. Then again, weigh in the chance of survival of everyone.... if you shield them from bullets to leave them on a battlefield... not much help...
5) Killing.... sure why not? pain on others is better than pain on you. Now if a gangster kidnaps your daughter and says "Jack, go kill president palmer"... the best choice would be to kill the gangster... cause he'll probably kill your daughter anyways...
But remember it's better to live and tell than to die for nothing.
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