Well, an aortic aneurysm may or may not be hereditary in nature. Dissections can be caused by uncontrolled hypertension, trauma to the thoracic region, such as a car, accident, or sudden burst of blood pressure which could be caused by things like cocaine use. So it isn't as simple as just saying aneurysms are hereditary, because they may or may not be. That's sad, the John Ritter aortic research foundation at the University of Texas has a long-term study of aortic health. I have done the genetic testing and I highly recommend that you contact them and get genetically tested. My children have all had imaging done as 9, 12 and 15-year-olds because it was determined I carried two of the four genetic markers for aortic aneurysms, and I have a paternal grandfather and a paternal uncle both of whom died of sudden aortic dissections. That makes my 2015 dissection the third paternal generation. I am now 61 years old and all of my siblings have had CT scans of their aortas. None of them have issues but it was important to know about giving the paternal history. You can get genetic counseling and testing through the Ritter foundation. I highly recommend you contact them and get that done. It's free and it will give you family some peace of mind. Here's a link to their genetic testing page:
https://johnritterfoundation.org/genetic-testing/
Peace.