my priorities (in order): money, sex, drugs

lol just kidding
now my real priorities (in order): money, drugs, sex

#1.1 Children
#1.2 Spouse.

Using the tied on the tracks example. I'd save my children before my wife, because at least with my children alive, my legacy can be continued, and there is always some of my wife in my children. So I wouldn't be completely deprived. But without the kids, all I'd have is a grieving wife.

Priorities:
1) Children
2) Myself: Career/Health/Those things
3) Spouse

I wouldn't know how to answer the train track situation... It's one of those things that can only be done. Given the circumstances, I don't know how I'd react unless I was in that situation.