- Ian likes to tell on Sherlock. You know, like if Sherlock does something he knows John won't like, he'll go tell on Sherlock. Not really purposefully, it'll just come out.
- For example, one afternoon Greg Lestrade paid the Holmes-Watson residence a visit, he asked what happened to a certain police report he gave Sherlock ages ago. Sherlock was claiming he gave it back, Greg wasn't having it, and Ian was growing impatient because he wanted to go for ice cream. "Ugh," he sighed, "It's in Daddy's drawer." When Greg asked what he was talking about, Ian said, "The papers, they're in the drawer." Greg held his fists to his hips and looked at Sherlock, who reluctantly gave the reports back.
- John thought it was hilarious, that Ian told on Sherlock, until it happened to him. They were sitting at the dinner table and Ian, who was nine at the time, blurted to Sherlock that Dad accidentally shrunk his favorite purple shirt. John tried to quickly hush Ian by saying it was a different shirt, and Ian swore to Sherlock it was the purple one, the one he wears and Mr. Dimmock stares at him. Sherlock said thank you to Ian and glared at John through the rest of their meal and all through the night, and John just looked sorry.
- At age 15, Ian learned how to prove Sherlock wrong and he continues to use this power. All he has to do is hear Sherlock say the words, "Prove it." and his mind starts to race almost as quickly as the consulting detective's.
- Ian learned how to prove John wrong at age four. All he had to say was, "Well Daddy said…" and John knew that Ian knew that John was wrong.
- Greg Lestrade taught Ian how to throw a powerful punch when he was five, and Sherlock knows it's powerful because he had a black eye from a power-packed punch for two and a half weeks.
- Ian has the habit of falling asleep in his own bed, then migrating downstairs to his fathers' bed in the middle of the night. Sherlock used to sleep naked, that is until he couldn't chart the pattern at which Ian migrated to their bed, so he found it wise to sleep with pants on no matter what day of the week or the weather outside.
- The first noises Ian made even remotely close to normal sounds, besides a cry or a wail, was growl. He growled from the moment he could make noise until he could actually talk. He growled the most when Uncle Mycroft was around.
- Ian growled so often as a baby that John called him 'Cub' for a very, very long time. It also had much to do with the baby's abundance of hair that resembled a mane and the bite marks he left once he could bite.
- When Ian was eight, he asked for a brother. Or sister. He wasn't going to be picky. He kept up the asking and pleading for at least a month, but of course John and Sherlock didn't want to have another baby. Finally, Ian's pleads ended one afternoon when Sherlock hung up on Mycroft, threw his phone against the wall, and shouted, "I'm going to kill my brother!" After that, Ian stopped asking. He told John that he was happy with just his dads, thank you very much.
- John loves the way Ian smells. Ever since he was a baby, John's thought he's smelled wonderful. In fact, the first thing John did when he held him the first time was sniff the baby. John loved to hold his baby and smell him, he loved to hug his toddler and smell him, he loved to sit next to his kid and smell him. John thought he smelled like Sherlock, just in newer form.
- Ian has had seven full blown tantrums in public -2 for John, 4 for Sherlock, and 1 together. There is such a number difference because while Sherlock can't find the right tune at which to punish his son, when he says no he means no; and when John says no he means, well son of you give me a cute little pout and ask three more times I'll say yes. Because really, when has John ever said no to Sherlock?
- These four tantrums for Sherlock happened at the shop, at the park, at Sherlock's mother's, and at NSY. These tantrums include crying, screaming, yelling, and laying on the floor with so much dead weight that Sherlock almost couldn't pick him up. As Ian laid on the ground and screamed, Sherlock stood as dignified as ever with his face in his hands and reevaluated whether this was really his life or not. When Ian was finished, Sherlock would pick him up and drag him home, then leave him in his room until John could come and sort them out.
- Sherlock and Ian fight. Of course they do, they're so much alike that they can't possibly get along all the time. They fight about everything, but John's favorite fight the two have is over the Solar System. Ian's always been very interested in the Solar System, and once he learned the planets (he was five), he'd fight with Sherlock over what they were. Finally, Ian would give up and tell John, "He'll never learn, Dad."
- Sherlock and John promised Ian they'd take him to the zoo for his fourth birthday. For three weeks, all the boy did was "Roar!" at people. Everyone thought it was adorable, but Mycroft stopped and asked, "What the hell's he doing?" and Sherlock said, "You idiot, he's a lion."
- Ian's favorite movie is Peter Pan.
- One time, Sherlock broke Peter Pan. It wasn't entirely on purpose, he pulled it a bit too roughly out of the DVD player and it snapped in half. Ian cried for quite a while until Sherlock took him to the store to buy a new copy.
- Ian's first kiss on the lips was when he was nine years old. It was from a girl named Patricia, Ian thought she was marvelous, but she broke his heart the next day. John thought the whole situation was hilarious and he was actually, to be honest, quite proud of his son in a manly fatherly way. Sherlock, however, wanted to teach Ian about hygiene and that he's too young and that girls were 'icky', but Ian said, "Maybe to you, Daddy, but I like 'em." John just laughed.
- Ian's first kiss was when he was nine, but Ian will always say it was when he was four, because he gave his first love a Christmas gift that he made and she kissed his cheek. His first love was Ms. Lindsey, she was his teacher's aid when he was in pre-school.