Chapter 1

My eight-year-old son stopped calling my husband Dad on his birthday.

Aaron was walking out of that birthday barbecue to comfort the boy born from a sperm donation he'd made in college.

I was still setting out the patio chairs when Vanessa's call came through the speaker, breathless and fragile.

"Aaron, please, come over. Cody's crying in his room. He had to draw a family tree for class, and he left the space for a dad blank. He keeps asking for you."

A familiar shadow of guilt crossed Aaron's face. He crouched down and reached for Owen's shoulder. "Buddy, I'm so sorry. Cody's really heartbroken right now. He needs someone..."

Owen didn't wait for the rest. He stepped back, out of Aaron's reach, and picked up his baseball glove.

"You should go, Aaron. Cody needs you more than the grill does."

The words dropped like a stone. Aaron and I both froze.

He hadn't always called his father Aaron.

A month ago, Owen broke his collarbone falling off the monkey bars, and I spent the night beside his hospital bed while Aaron took a 3 a.m. call from Vanessa and walked out of the ER. When I finally asked if my son wanted to text his dad, Owen typed two words instead: We are leaving, Aaron.

He'd braced himself for me to correct him. I never did. His father's first name was the only wall an eight-year-old had left against the man who kept choosing someone else's kid.

Owen looked at his father now with flat, patient eyes. "Aaron, you should hurry up."

Then he looked over at me. "Mom, I'm hungry. Can we just eat?"

He pulled me toward the backyard, leaving Aaron standing there.

Six months earlier, a DNA registry had led Vanessa to my husband, and to Cody, a six-year-old with Aaron's exact green eyes. Aaron had donated sperm for textbook money in college and never thought twice about it. Then the boy showed up, and the guilt swallowed him whole.

I never asked him to turn his back on Cody. I asked for boundaries. But once became twice, then a routine, until I was a single mother inside a two-parent household.

So I'd had a lawyer draw up the divorce papers and slip them past him inside a stack of mortgage refinancing. Before filing, I gave him thirty quiet days, not to test him, just to be sure I'd never doubt myself.

This was day twenty-eight. His son had already given me my answer.

Aaron snapped out of his shock and stepped after us, then his phone rang again. Vanessa.

"Aaron, where are you? Cody's ripping up his homework. I can't calm him down!"

He stopped walking. He stood there staring at our backs, the phone pressed to his ear.

"I'm pulling out of the driveway now. Give me ten minutes."

He hung up and fired off a text. We'll do cake tonight. I swear.

Then he turned around and walked out the front door. The engine roared to life, and the sound faded down the street.

Owen set down his baseball glove and threw himself into my arms, his small body shaking.

"Mom."

"If he wanted Cody more, why did he even have me?"