Threatened with probate related lawsuit over truck I bought 4 years ago . Las Vegas, Nevada.

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Hi all, I’m looking for legal guidance on a situation that just came up out of nowhere.

Over 4 years ago, I legally purchased a fully paid-off truck from my girlfriend’s mom. She signed the title, I paid cash, and the DMV processed the title transfer into my name. I’ve had full legal ownership and registration since then with zero issues.

Now, my girlfriend’s sister is claiming the truck technically belonged to their grandfather, who passed away several years ago. She says it should’ve gone through probate and is now threatening to involve the probate court to try to “reclaim” the truck from me — or subpoena me somehow. She’s claiming to have talked to a lawyer and that she’s adding me to the probate case.

From what I understand:
• I bought the truck in good faith.
• It’s been in my name for over 4 years.
• I had no knowledge of any probate issues at the time.
• The seller (my girlfriend’s mom) had legal title in her name and signed it over to me.

I’ve read that good-faith purchasers are usually protected in these situations, and that any claim from the estate would be against the seller, not the buyer. Also, I assume they’d need to file a whole separate civil suit to come after me, not just threaten it through probate.

Am I at any real risk here? Or is this just empty talk from someone who’s trying to stir up drama? Appreciate any legal insight, especially if you know Nevada law. Specifically location: Las Vegas , Nevada.