My son Leo had the kind of curls people remembered.

They were soft, bright gold, and impossible to ignore.

They bounced when he ran across the yard, sprang loose from every knit cap in winter, and caught the late afternoon sun until his whole head looked lit from within.

He was five years old, all scraped knees and missing front teeth and endless questions, and those curls somehow suited every inch of him.

They made him look wild and joyful and completely himself.

To me, they were beautiful.

To my mother-in-law, Brenda, they were a problem.

Brenda believed boys should look a certain way.

Hair clipped short.

Shirts tucked in.

Knees clean.

She had a voice that could make judgment sound like common sense, and from the time Leo’s hair started curling past his ears, she had something to say about it.

She would tilt her head, purse her lips, and ask whether it was finally time for a real haircut.

When that didn’t work, she got sharper.

He looks like a little girl, she said once while Leo was sitting three feet away coloring dinosaurs.

Another time she told me boys shouldn’t have pretty hair.

Pretty was for girls.

Handsome was for boys.

It was exhausting, but it was also so constant that I made the mistake of treating it like background noise.

Mark never let it slide.

He would shut her down in the same calm voice every time.

Leo’s hair is not up for discussion, Mom.

Brenda would give that tiny closed-mouth smile and change the subject.

I should have paid more attention to that smile.

It wasn’t surrender.

It was storage.

She was putting away her anger and waiting for a moment when she could act on it.

What Brenda never bothered to ask was why Leo cared so much about his hair in the first place.

The answer had nothing to do with style and everything to do with his little sister.

A year earlier, Lily had been three and very sick.

It started with bruises that didn’t make sense and fevers that came out of nowhere.

Then came blood tests, terrified whispers in hallways, a specialist who would not meet my eyes until he absolutely had to, and the word leukemia falling into our lives like a piano through the ceiling.

We lived in fluorescent light for months after that.

Hospital rooms.

Infusion chairs.

Plastic cups with paper-thin juice.

The smell of hand sanitizer on everything.

Lily’s cheeks grew pale.

Her appetite disappeared.

Then her hair began to come out.

I will never forget the first morning she realized it.

I was brushing what was left of it after a bath when strands started collecting in the bristles.

Lily touched them, stared at her own fingers, and looked at me with a fear no three-year-old should ever wear.

She asked whether she was disappearing.

Before I could answer, Leo climbed onto the bed beside her.

He was only four then, but his face had gone solemn in a way I had never seen before.

He touched his own curls, then touched her bare patch near the temple.

When are they coming back? he asked.

I told him they would come back after the medicine did its job.

He thought about that for a long