- One winter, Sherlock and John both let their hair grow well past their ears. One afternoon, Sherlock was putting on chapstick that was making his lips more glossy than he wished, and three-year-old Ian went to him and said, "Daddy, you look pretty like a girl." Sherlock cut his hair the next day.
- Ian sees people. He sees what they do, how they act, at a young age he could predict what they were going to do next. He can do exactly as Sherlock can. However, the difference is that Ian understands what Sherlock can't. When Sherlock and Ian both see someone eyeing John, Sherlock will ask himself, "Why is that person staying at John?" and Ian will say to Sherlock, "That person likes Dad."
- In case you didn't know, Ian has four cousins, two are Mycroft's sons and one is Harry's daughter. Of course Sherlock's mother loves her other two grandsons, but to be honest, Ian's probably her favorite. Don't tell the other two.
- When Sherlock was young, he fancied Jordan Knight. When John was young, he fancied Madonna. Ian is young and fancies Amy Pond.
- Quarter annually since he was about three until he was about seven, Ian would keep John up all night to look for Peter Pan or Tinkerbell.
- Ian had an imaginary friend named Harmony when he was younger. He described her as, "Beautiful, pleasant, smart, and funnier than you, Dad." Sherlock thought it was insanely creepy and to this day is afraid of the harmless, imaginary Harmony.
- Since he was twelve, Ian's had reoccurring dreams that he's falling. He didn't understand for a long time why that scared John so much.
- John and Sherlock told Ian everything that happened about Moriarty and the fall when Ian was 15. Ian had picked up on bits and pieces over the years, and finally he asked them what happened. He wasn't sad, not that John expected him to be; he wasn't there. All Ian did was take Sherlock and hug him tight. Then John cried. Then Sherlock cried. Then they had Angelo's.
- Sherlock thinks Ian cried more than any normal kid.
- When Ian was younger, he loved jumping on his fathers' ridiculously springy bed. Often while his dads were still asleep.
- Sherlock liked to lay back and watch him, and Ian would shout, "I'm gonna jump as high as I can, are you watching Daddy? Daddy, are you watching me?" and Sherlock would laugh and as Ian jumped as high as he could, Sherlock would grab him and tickle him until he screamed.
- John didn't let anyone touch Ian's hair until Ian was nearly five. His hair was almost touching his shoulders.
- Ian likes to steal things from Sherlock. Well, no. Not according to him. According to him, he's taking Sherlock's things for safe keeping.
- The first item he 'stole' was Sherlock's iPod. Sherlock misplaced it one evening and John said, "You should put it somewhere for safe keeping, that way you always know where the safe place is." Ian took it his liberty to find the safe place, and he didn't tell Sherlock. Finally, Sherlock nearly destroyed the flat when Ian told him it was in bottom dresser drawer.
- Ian's also stolen Sherlock's favorite blue scarf, John's glasses, the dog's water bowl, Mrs. Hudson's feather duster, three of Greg Lestrade's ID badges, and Uncle Mycroft's cell phone. The last thing he took was the skull, and it was the last thing because Sherlock asked him to stop.
- Until Ian was five, Sherlock didn't like leaving him alone in the flat -alone being while Sherlock was in the shower. Sometimes he would just wait to shower until John got home, but when he really needed to, he'd sit Ian down on the bathroom floor with Sherlock's laptop playing Peter Pan. Ian wouldn't move a muscle.
- In case you're wondering, Sherlock would make Ian sit in the bathroom because he was afraid Ian would touch whatever experiment was going on on the kitchen table.
- Ian was Sherlock for Halloween when he was nine; the impressions he did were uncanny.
- What was even more scary was the next year he was John and his facial expressions and body language matched that of his father perfectly.
- When Ian was three, he bit Anderson. Anderson pulled his hand away and stared at Sherlock like, "Aren't you going to do something?" Sherlock looked at Anderson, looked down at Ian, and high-fived the kid.
- The next year, Sherlock and Ian ran into Sebastian Wilkes at the bank. Sebastian was shocked that Sherlock had a son, hell that he even got married. Ian asked who he was and Sherlock told him Sebastian's name, and Ian said, "Oh, my Dad said you're an asshole." Sherlock quickly left without saying anything.
- Ian read the Harry Potter series when he was ten, and he loved them. He even convinced Sherlock to read them.