-When Ian was a baby, about eighteen months old, he saw a balloon cart at the park and cried because he wanted one. Sherlock, who really hated seeing his baby cry, bought all the balloons. They had balloons floating around the flat for weeks.
-Ian really hated snow when he was young. When it'd snow he'd avoid the windows and would only go outside if he had to. Finally, John showed him that snow wasn't anything to fear or dislike by packing a dozen snowballs on a cooler and throwing them at Sherlock as he sulked on the couch.
-Sherlock and John bought Ian a video game system for his eighth birthday. They told him that it was all his and he had to not break it. Ian's first act as rightful owner was banning Sherlock from playing it two weeks later because Sherlock wouldn't let him win.
-John had difficulty explaining to Ian what VHS tapes were. Ian kept saying, "Why didn't they just always have DVD's?"
-For Ian's tenth birthday, they took him to Disneyland Paris for two days. Ian had a blast, and as much as he would never admit it, Sherlock did, too.
-John had a Star Wars and Lord of the Rings marathon with Ian when he was seven. John made him watch the Star Wars movies in the order they were released, starting with Episode IV: A New Hope. By the time they reached the end, Ian was so shocked that Darth Vader was Luke's dad.
-Sherlock's lost Ian a couple of times. He just…forgets. Ok?
-Ian once asked why there were holes in the wall. John gave him a looooooooong lecture about gun safety.
-Ian liked to copy everything John said. Sherlock thought it was hilarious, especially when Ian shouted, "God damnit!" for three days.
-John thinks that Sherlock bought Ian so many toys when Ian was young because Sherlock liked playing with the toys as much as Ian did.
-When Ian was five, there was a kid in his class named Jamie that was always so mean to Ian. Ian would say how Jamie pushed him and called him names. It took them all year to realize that Jamie was a girl and they only realized it because Ian told Sherlock, "I can't hit a girl, Dad."
-John always kept Ian in their bed when Sherlock was on his 'no-sleep-during-case' runs.
-Sherlock never got used to waking up with little eyes staring at him when Ian would sleep with them.
-Ian spent a weekend with Aunts Harry and Clara one weekend when he was thirteen. He spent almost the whole weekend looking through all of Harry's old photos of John and picking out the best ones to show Sherlock. One of the best ones ended up framed on the mantle. When Mycroft went over the next time, he saw the photo, went to Sherlock's mother's, and sent Ian three dozen old photos of Sherlock. The best one got on the mantle, too.
-Sherlock would try to help Ian with his homework almost every afternoon. And by try, I mean Sherlock would sit with him at the table and constantly ask if he needed help, and Ian would finally say, "Dad, you're really bothering me." And he'd force Sherlock to leave.