Figured out McCoy

Lara regarded me warily and then mirrored me as best she could on one leg, which was excellently. “You’re sure?” Lara demanded a moment later, rolling the ankle on that leg several times.
“Thomas was,” I said.
“And they didn’t tell m …” Lara pressed her lips together. Then she shifted her grip to a more aggressive stance, something like mine, and I came onto guard to match her. We thrust and parried for a moment, circling. “Have you told his grandfather about him?” she asked.
I faltered at that, and Lara sent a thrust at me that hit me square in the belt buckle and shoved me off my feet and onto my ass.
I sat on the floor for a moment, eyeing Lara, who grounded her staff and bowed exactly as I had and regarded me calmly.
She knew about Thomas and me. I mean, I’d been aware of that, but she’d put together enough to work out who Ebenezar was, too. The White Court had a reputation for being insidious subversives. Connections to them, regardless of their source, were regarded with what most of the supernatural world considered healthy suspicion. If Ebenezar’s connection (and mine) to the White Court became public knowledge, the ramifications for our current situation were … sticky.
And Ebenezar didn’t just have issues with vampires: He had volumes and ongoing subscriptions. It had the potential for a real humdinger of a mess.
“I’ve known from the beginning,” she said impatiently, as if she’d been reading my thoughts. “I was here when my father was so obsessed with your mother. He made me play nanny to Thomas. I often heard them talk, because apparently no one in my family understands what a deadly weapon the ability to listen can be, and she left Thomas in my care once when she visited McCoy. And after she died, I helped Father hang her portrait in his psychotic little egomaniac’s gallery.”
I nodded. “But you never brought it up. Never used it for leverage.”
“No,” she said. “Because I’m also the one who changed Thomas’s diapers, after his mother escaped our father. Dressed him. Fed him his meals. Taught him to read.” She shook her head, her eyes focused on one of the banners. “I’m more ruthless than most, Dresden. But even for me, there are limits. Most of those limits involve family.”
“That’s why you didn’t use it against him,” I said. “How come you didn’t use it against me?”
“You never gave me a good reason to fight quite that dirty,” she replied. “And I couldn’t have used it against you without exposing my brother to trouble as well.”


Peace Talks Chapter 14, Page 131-132