If this was a case of your selling deceased relative's property and you disclosed this was inherited?
I am not a lawyer, but I suggest you consult with one if they try to come after you for any of this. They can ASK you to pay all they want... but I'm pretty sure a real estate attorney will tell them to go pound sand. Contact YOUR realtor and ask them if you are liable and confirm it was made clear in the paperwork that this was not your property (inherited) and all you knew was in the papers.
Tell the new owners "so sorry, but we didn't know about the damage. We sold the house in good faith, and had no idea there was any damage or issues other than what was stated in the disclosure documents. You hired an inspector and they said it was fine. We're not responsible for any damage that was not found or visible during inspection. You may want to take it up with the inspector you hired for missing the damage, but we are not liable or paying for fixing any damage/repair work on a house we no longer own that was sold "as is" at this point."
Damages/issues that were not noticed/discovered during the inspection process are not your responsibility as they had inspectors out and no one knew there was any damage. That is what an inspection is for. They miss things sometimes and that's too bad, but the buyer is taking on all future discovery/repairs after they're the owners unless there was fraud/intentional misleading information given.
So say 6 months from now, if a pipe breaks due to a tree root that had grown into it (which takes decades, obviously happened before these people purchased the house) and causes $10K worth of repairs... is that going to be something they think you need to pay for too? Or there was water damage from a slow leak in an upstairs tub and they discover that a year from now? You can't be held liable for things you don't know about FOREVER.
In most all cases it's any issues discovered once they are the owners (after closing) it's on them, unless you knew about the damage and covered it up intentionally.
And if your realtor tells you anything about how maybe you should pay them or give them something... do consult a real estate attorney to go over your paperwork. There's no way based on the facts as you presented that you should be liable for a penny.
You sold a house you did not live in, disclosed that information and any other info you likely knew (which likely wasn't much) and allowed inspection by potential buyers before purchase. Unless your dad told you a year ago that they'd had termites and you hid that damage yourself after inheriting the house - there is no way you are responsible for repairs after the buyers took possession.