Hi. I was served a summons in a probate case in which I am named only as an heir (not a petitioner, not a respondent). Do I owe anyone a "response"?

Four of my siblings are suing the fifth, who was named as executor. I am an heir but I have no problem with the way the estate was settled so I essentially don't want anything to do with this suit. Why was I issued a summons? There are no questions or "action items" directed at me in the petition. I was named as 2nd executor if my sister was not able to do it, but that was not the case (and as I said, the petition did not have anything directed at me). Not sure why a deputy was sent to my house to deliver a summons instead of sending the petition via email or certified mail? I called the plaintiff's attorney and he said they just wanted to make sure I received it and that seems weird. Thoughts?