Sibling Rivalry Analyst T-Shirts

"And then, as soon as I had carved out my niche, they went and had another kid."

'I am so proud: My kids are finally fighting all the time!'

'Meet my new little brother. The future 'spoiled little brat'.'

"Why do you decide everything? Why were you born first? Who made that ruling? And where do I file my appeal?"

Polygamists' Picnic

"He's my smart-aleck twin."

"I'm an oldest child trapped in the body of a middle child."

"Good work Tim, you snatch it all: none of this sharing with your brother nonsense..."

It's my biggest project - a database of all my sister's boyfriends.

"At home there's a fish, a cat, a dog, me, and a big sister."

"We tried to play nicely, but frankly it's not as much fun as tormenting each other."

The noise from the basement was probably nothing – but if it was, she was a sacrifice her older brothers were willing to make.

Help!I am being forced to eat vegetables

"Act your birth order!"

'My brother got all the glory. For me it was Randolph with your nose so pink, you really make my sleigh team stink.'

"Gracie, I'm getting way tired of your Jane Goodall routine!"

'Mum, she pulled my mane!'

"It may be called a 'Butterball', but you still can't throw it at your sister!"

LEMONADE 50 CENTS, 'Sorry, cash only -- we don't accept little brothers.'

"You can't live in our basement. Your brother beat you to it."

'At first I wanted a brother, but I've changed my mind... I want a puppy now.'

'I suppose this puts my new bike on the back burner?'

'Does this mean I have to share my pocket money?'

"If you have one child you are a parent but if you have two, you are a referee!"

'Stop crying or Mom will think we're not having fun!'

"How many times do I have to tell you to quit going through your little brother!"

You'll grow into your sister's hand-me-downs soon enough, dear.

'How do you expect them to treat you in a mature way with that thing in your mouth?'

'Take it from someone with experience. . . you can't go throwing tantrums until you've at least tossed a few.'

'Mom! - Jeffrey just said a DADDY word!!'

"Meet your new baby brother! We decided to upgrade."

'No hair or teeth, can't walk or talk -- he's kind of a starter kit.'

Technically, no, dear, your brother isn't plagiarizing you. ABC. ABC.

'MOM! -- Samantha called me names in her diary!'

"I'm wearing new cologne. I hope Smiley is able to control herself around me today."