How do I negotiate or even scare an insurance adjuster after a home burned down?

I live in rural Nebraska and unfortunately our neighbors home burned to the ground last week. It was fucking scary how close it came to our house but luckily we survived and our property is fine. My neighbors on the other hand are now homeless and struggling in all respects emotionally and physically. I have seen them on endless phone calls with their insurance company and I believe an adjuster will be coming out any day now to assess the damages.

I hate to see my friends suffer even more and get an unfair claim. Do any of you have advice on how to maximize the money they might be able to recover from insurance? I obviously don't want to help my neighbor do anything illegal but I want to know the tips of the trade on how to be diligent in claiming every single item that was in the home. Thanks in advance.