This story is pathetic, the man who introduce me to bitcoin,
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?
OP, this is a serious situation, and I don't think the deceased even have enough time to think very well before selling their holdings or not, unless their sister is not so important to them (let me just put it that way). Or perhaps if this guy has another means to pay up the ransom as soon as he can without selling his Bitcoin, then he should go on and get money from the other means, but with what you said already, even the Bitcoin he is holding cannot cover the ransom, so he will need to sell the Bitcoin and still take out a loan to complete the transaction.
OP, if this story is not false, just as other members are strongly suspecting it is, then I have just one piece of advice that can work, which is, let him take a loan and use his Bitcoin as collateral.
You said he introduced you to Bitcoin, and here you are in the forum, so possibly he is also a member of this forum. He can get a loan here and use his Bitcoin as collateral, or he can still get another of his Bitcoin colleagues to help him with the loan and use the Bitcoin he owns as collateral.
Everybody is confuse.
Why? No, am not confused 🤔.
What then will make you to sell even if the price is against you?
Bad emergency (disaster) that only presents me one option, which is to sell.