I found this article: https://www.wibw.com/content/news/DNA-test-reunites-long-lost-Topeka-half-brother-and-sister-54-years-later-504929391.html. MyHeritageDNA was the testing company.
The two share a father and were born just two months apart in 1964. After over five decades of not meeting, or even knowing each other existed, they are making up for lost time.
You may not know about half-siblings, full siblings, adoptions, or other situations that may show up through DNA testing. I always warn people to expect surprises if they are considering DNA testing. It may be something as simple as finding potential medical issues to something as complex as finding out you were adopted or that you have full or half-siblings you didn’t know about.