Sorry for your loss. Here is a link showing all of the filings that occurred in Section 25, T 10 N, R 22W since 2016. I don’t see any probate or distributions from a trust. Click Here
Oil and gas leases are weird, the three years is probably the primary term. This basically means that the company has 3 years to drill. If they do so and produce minerals then the lease can last for decades.