You get the video authenticated so it cannot be waved away as a fake.

You get the banks to freeze the disputed accounts through proper notice, so the money stops moving while you work.

You get your own authority documented and airtight, so that when the day comes, you are not a grieving relative making wild claims but a lawfully appointed trustee presenting an evidentiary record.

And you let the targets keep talking, because targets who believe they’ve won cannot help themselves.

I have watched sophisticated criminals give me the last piece I needed simply because they could not resist gloating to someone they’d beaten.

My family was not sophisticated.