There seems to be a lot of people using DNA kits and inevitably having unwelcome surprises. That's what curiosity gets you.
I listened to a radio 4 account yesterday, a woman talking about buying a kit as a present for her dad. He seemed reluctant, with good readon as it happens. She discovered as her mum admitted she had had a one night stand. So she tracked down her real father's family, who wanted nothing to do with her, especially as he happened to be now dead. So she carried on this saga. Finding out that her real father was Jewish, so she began exploring her Jewish roots. I switched off at this point. Shaking my head!
I felt throughout that she was so utterly selfish and self-centred. Quite fine about trampling her way through many people's lives.
In my view, it's best to leave such things alone unless it is vital in some medical or other way. Our parents were once young, may have made mistakes, taken decisions they regret. What use is it to rake up the past? Curiosity can be a bad idea sometimes.