My son got into a fight at school because another boy wouldn't stop calling him his "brother.

My son got into a fight at school because another boy wouldn't stop calling him his "brother." I marched into that office ready to apologize for my kid's temper. Then I saw the other boy's face, and every bit of blood in my body went cold.

Eight years earlier, I'd been pregnant with twin boys. Labor came weeks too early, everything went wrong fast, and when I finally woke up two days later, there was only one bassinet beside my hospital bed.

One baby.

I looked at my husband, Foster, and whispered, "Where's the other one?"

He wouldn't meet my eyes. "He didn't make it."

I never saw a body. There was no funeral I attended. Foster told me I'd been too weak to handle any of it, so he'd taken care of everything himself while I recovered. I believed him, because why wouldn't I have?

From that day on, I poured every ounce of love I had into Milo. Years went by. By the time he started elementary school, I'd learned how to carry the grief without it swallowing me whole every single morning.

Then Milo started mentioning a boy named Silas.

One afternoon, he stormed in and threw his backpack on the floor. "Silas called me his brother again!"

I laughed it off. "Maybe he's just messing with you, bud."

Milo rolled his eyes. "He keeps saying we have the same dad but different moms. It's so weird."

Something twisted low in my stomach for a second. Then I told myself kids say strange things constantly. It didn't have to mean anything.

A week later, the school called. "Milo's been in another fight with Silas. This one's serious. You need to come in."

I rushed over, already rehearsing an apology for my son's temper. The second I stepped into that office, I went straight to Milo.

"Baby, are you okay?"

He didn't answer. He just lifted his hand and pointed at the wall behind me.

Another boy sat there.

I turned around, and I froze completely.

Same gray eyes. Same narrow face. Even the small birthmark near his eyebrow sat in the exact same spot. It looked like somebody had taken my son and made a second copy of him — the only real difference was the hair. Milo's was light. This boy's was almost black.

My hands started shaking. "How is this possible?"

The principal watched me carefully. "We're waiting on his mother. Once she arrives, I think a lot of this is going to make sense."

Before I could ask anything else, the office door swung open behind me.

I turned around.

And the second I saw who was standing there, I screamed.

I recognized her instantly, even after eight years — Renata Kessler, the labor and delivery nurse who'd worked my entire delivery, the one who'd handed me my son and told me, with careful, practiced gentleness, that his twin hadn't survived.

"You," I said, my voice barely functioning. "You were my nurse. You told me one of them died."

Renata's face had gone pale, her eyes moving rapidly between me, Milo, and the boy sitting against the wall.

"Naomi," she said, "I think we need to talk somewhere private."

"I think you need to explain to me right now," I said, "why my son's dead twin brother is sitting in this office."

The principal, understanding immediately that this conversation had moved considerably beyond his own jurisdiction, quietly excused himself, promising to give us the room.

Renata sat down heavily in one of the office chairs, her composure cracking in a way I'd never once seen from her during the calm, professional days after my delivery eight years earlier.

"Foster and I were involved," she said quietly. "Before your delivery. It started about four months into your pregnancy."

I felt something in my chest go completely hollow. "You were sleeping with my husband while you were my nurse."

"I know how that sounds," Renata said. "I'm not asking you to forgive it. I need you to understand what happened during your delivery, because I don't think you fully do yet."

"Then explain it," I said. "All of it."

"Both boys were born healthy," Renata said. "Milo first, then Silas about eleven minutes later. There were complications with your own recovery, significant enough that you were sedated for almost two full days. Foster came to me the night after the delivery and asked me to help him."

"Help him do what?" I asked, though some sick, dawning part of me already understood.

"He told me he couldn't afford to raise two children on his salary," Renata said. "He told me he'd always wanted, secretly, to start a life somewhere else eventually, and that Silas could be the beginning of that, if I was willing to raise him as my own instead of putting him up for adoption through official channels."