Through DNA testing I found my (deceased) mother's bio family. My DNA relative (1C1R) has been wonderful and very interested in the connection and has shared a lot of information. Unfortunately his uncle (my mother's brother) remains unaware that he had an older sister who was adopted out and had a family of her own.
My DNA relative is into genealogy and had previously asked his uncle (my mother's bio brother) if he would be willing to do a DNA test, and he declined. This implies he didn't want to find out any secrets. Fair enough.
So, we are stymied. My new "uncle" has adult children who would be my first cousins. They aren't aware of us, but we are aware of them.
We're just leaving things alone, since we don't want to disrupt any family dynamics. It's just not that important. I just worry that my "new" cousins might actually be interested in finding out about us, but that would mean they would have to have a secret from their father.