I'm stuck at the Krauss Family tomb

Doing the 7th year quest "Any Means Necessary" and I've spent over half an hour trying to figure out the puzzle at the Krauss Family tomb. There's clearly four hints; and I've wracked my brain as much as I can. But... nothing. Could I have another hint please?

Absolutely! If you haven't already been able to solve the puzzle, you'll want to keep an eye out for something in the tomb there are also four of. Conversion is the name of the game to get your final code.

Hope this helps!

Got it! I counted each letter of their names. Thank you for the hint!