but the whole thing looks like a plan work from some people close to him because many people know him to be crypto dealer. Now this money is never available anywhere, 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.
This is the major reason it's advisable to stay on a lowkey while doing one's business. Every crypto or forex trader has to find a way not to over expose themselves. Most people who comes across crypto dealers have that misconception that the dealers are rich whereas a lot of us could barely live up to expectations. So, why expose oneself then just to feel good on pretence?
If the man's only hope of securing his sister's release from the kidnappers' den is to sell off his Bitcoin and he cares about his sister's life, let him do the needful. However, if the reverse is the case let him also do the needful.