My dad has been hacked of all of his money and he is in a war zone please help us out

So he has been scammed by a guy claiming that he is a lawyer.

I suffer from multiple chronic illnesses and I was unable to really see what he’s doing because I was really feeling ill for the past month.

The story goes like this. Some guys scam him to invest in crypto and to withdraw the money he had to keep adding. I reported them to the police but they did nothing.

Fast forward he found a lawyer on facebook and the guy said he will help him out in return of 8% of the money he will get back. Same thing, he fooled him into investing into crypto, then he said he needed to invest another 1000$ because the money had to go into a mixer. My dad did.

I got better and I did some research on this guy, he uses a fake name and a picture of a lawyer from canada but pretends he’s from the UK.

Now he’s asking for another 1200$ for this mixer thing which I am sure is a scam. He left my dad broke and in debt and my dad is in a war zone, things are hard enough.

I did some research but it is truly out of my area of expertise, I don’t know how trust wallet works, but I am not stupid.

The guy claims that revolut refused the money because they were dirty, but we were using my mom’s account which he couldn’t have had access to. So how would he know that? Except that it is a lie to scam my dad?

I am sure that the money that went into the mixer went into his wallet in fact. He also told my dad that he won 18000 $ somehow which is a far strech so he would invest more.

Please help me out here.

What is this scam? How can I explain it to my dad?