Hello,I'm Zoey and I'll be assisting you. Are you online now?
This scam, for reasons which, unfortunately, are only too obvious, is known as the Grandparent's scam. Typically, it's run out out of West Africa, which is why the police just shrug and tell you they can't handle it. It occurs when hackers get a hold of someone's email or Facebook contact list and then they make calls or send messages pretending to be the Facebook or email account holder -- in this case your son -- and they claim that there's an emergency for which you have to send some money immediately.
It's the kind of request which can get very quick reflexive results from loving parents, grandparents and other family members. The scammer will ask for payment via a method which will get to them instantly and which will be untraceable. Usually that involves Western Union, MoneyGram or a Green Dot money Pak Card.
Once they get the money they ask for, they claim it immediately, and the transaction is irreversible. By the time the grandparents/victims calm down, make some phone calls, and find their family member is just fine, they are out money which they won't see again, unless these thieves can be found and brought to justice. Frankly, the prospect for that is very, very low since they could be anyone, anywhere in the world.
The FBI correctly informed you that you need to report it to them on their website. No doubt they sent you to their Internet Crime Complaint Center at IC3.gov. On that site, the FBI is partnered with Interpol, which will make your case and details available to law enforcement agencies around the globe. But you need to understand that these people use entirely false contact information and they can literally disappear into cyberspace. The overwhelming number of scammers get completely away with their crime.
Where does that leave the grandparents? Unfortunately, unless they want to throw good money after bad and try to hire an international private investigator to see if he can find the scammers, it leaves them out their money, probably for good.
The only thing I can tell you is that when you are the victim of a crime -- as your father is here -- his unreimbursed losses are tax deductible. So he'll be able to get something back in the form of a deduction when he files his 2016 taxes.
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.