the man's only option is to sell his bitcoin and even if he does is not up to the amount. Do you advise he sells and bail his kid sister? Everybody is confuse.
Assuming the story is true, but why everybody is confuse? The answer for this question (if you're not heartless) is too obvious. Now if he chose not to sell his Bitcoin to save his sister because of his own reasoning, just shows what kind of a family member he is.
What then will make you to sell even if the price is against you?
In urgent situation that I don't have anyone to count on financially, even it's hard and even it's against my will. But if selling my Bitcoin is the only solution to save me in such situation, I'll be glad instead. There's always a chance to buy back anyway.