What to Write in a Big Brother Book (60+ Examples)

You will always be our first boy — and now you're our first big brother.

Being your big brother makes this baby one of the luckiest little ones around.

The day you became a big brother, you became someone's first hero.

No matter how many siblings come along, you will always be number one, first.

You are kind, you are strong — and you are going to be an incredible big brother.

Welcome to the biggest, best promotion of your life.

Your little sibling will watch everything you do, so just be you — you're the best.

Our hearts didn't split in two — they doubled. And so will yours.

Being a big brother is a forever role. And you wear it well.

May you always be each other's loudest cheerleaders.

You've been practicing with teddy bears — now comes the real team-up.

Thank you for being patient with us while we figure out the new baby, too.

You made us a family of three, and today you make us a family of four.

There will be noise, there will be chaos, and there will be so much love.

You're going to be the one your sibling looks up to. That's a pretty big deal.

We love you as much today as we did yesterday. And tomorrow, even more.

Your love will be one of the first your sibling ever knows.

You were always the big plan. This is just the next great chapter.

Show your sibling the way. Be the older brother we already know you are.

Big brothers are first coaches, first teammates, first best friends.

Congrats on the promotion — you are now big brother. The pay is snack-based.

New teammate incoming. They cry a lot, but the trades are non-negotiable.

Heads up: your LEGO collection is now a shared investment portfolio.

Welcome to big-brotherhood. Training manual: none. You'll figure it out.

New rule: whoever makes the baby laugh first wins bragging rights.

Side effects of becoming a big brother include sharing the remote. Eventually.

You are officially in charge of teaching the new kid the good snacks.

Big brother: part bodyguard, part cheerleader, part snack thief.

You have been given the important job of helping (and occasionally tattling).

Your sibling is about to think you are the coolest human alive. Use it wisely.

Welcome to a lifetime of being asked, 'why are you their favorite?'

The baby cannot yet argue back. Savor this rare era.

You've been upgraded from only child to head of operations.

Pro tip: you outrank them by default. Use your powers for good.

Heads up: your toys are now 'our' toys. It'll work out, mostly.

Warning: you may now be asked to watch the baby 'for one second'. It is never one second.

Congrats — the sock-finder of the household now has more socks to find.

New job description: Chief Giggle Officer.

You're not losing the spotlight — you're now the lighting director.

You're going to crush this. Also, mom and dad could probably use a nap.

A brother is a friend given by nature. — Jean Baptiste Legouvé

A big brother is a hero without a cape.

Brothers don't necessarily have to say anything to each other — they can sit in a room and be together and just be completely comfortable with each other. — Leonardo DiCaprio

A brother is a gift to the heart, a friend to the spirit.

Brothers by birth, friends by choice.

No one will ever understand my crazy quite like my brother.

Having a little sibling makes every story twice as long and twice as beautiful.

Being a big brother is the greatest promotion of your life.

You were somebody's answered prayer.

Your love will be one of your sibling's first languages.

Today you became something even bigger than yourself.

A brother is a little piece of childhood that never grows up.

Sometimes being a brother is even better than being a superhero. — Marc Brown

You were the first face of family your little one will know.

The greatest gift our parents ever gave us was each other.

Brothers are different flowers from the same garden.

Bravery runs in the family — and it starts with you.

To the world you are one person, but to your sibling you are their world.

Side by side or miles apart, brothers are always connected by heart.

Where there is great love, there are always miracles. — Willa Cather