This person says they got no inhertance on a court paper, I know they did, is it public rcord can I get a copy?

I don't understand the question - they got no inheritance on a court paper? Do you mean they have filed papers in Court saying they did not receive their part of an inheritance?

How are you involved? It may or may not be public record. Some of this depends on how the assets were distributed.

What are the circumstances?

(Why is this under private investigators?)