Fidelity requested my former sister-in-law’s death certificate. Am I due a surprise inheritance?

<iframe
  src="https://statesidedaily.com/embed/cluster/dcd5573a5783c1c24fffc34cf1a0aa151d7317a3"
  width="100%" height="320"
  style="border:0;max-width:680px"
  loading="lazy"
  title="Fidelity requested my former sister-in-law&#x2019;s death certificate. Am I due a surprise inheritance?"></iframe>