If this was a baby Death Eater, he was doing a good job at being innocent, that was for sure. Tonks had let her guard down at this point, studying the little boy closely. There was really no way to tell for sure if he was telling the truth. He said his mother had her name, but that could be a lie. Of course, she doubted anyone else in the world had her name. So he was either trying to get her to drop her guard on purpose or he was telling the truth.
Regardless of his level of truth, she made a face at the sound of her name. "Andromeda," she told him, crossing her arms over her chest. "I promise I'm not tricking you... are you trying to trick me?" This was confusing and curiosity was getting the better of her. While she didn't want to ask this question, she really had to know.
"What's your da's name?" she asked him, quirking an eyebrow, hoping it looked like she already knew. Okay, that was a little tricky, but if she was his mum she had every right to know!