I am THIS tall!
Mikey smiled as Splinter marked the post in the kitchen entry. Stepping away he saw that he had grown a few more centimetres since last time.
"I bet I'm gonna outgrow Raph like this!" He exclaimed.
"Will not!"
"Will too!"
"Doesn't matter because I'm the tallest." Leo announced.
"I don't think so." Don commented. "I think I have longer legs than you, and sitting down I am taller than you." Don protested as he tried adjusting his wheelchair. Getting around was a bit difficult even with the chair, all the doorways had bumps and hurdles.
"That's not how it works." Leo protested. "Mikey is also taller than me when we sit down, but I'm taller than him when we stand up. You're the shortest."
"I am not the shortest!" Donnie protested.
"Enough!" Splinter interrupted. "You will not fight over this. Who is tallest and who is shortest does not matter."
Don looked up at Splinter. "But I wanna know how tall I am."
Splinter paused and looked at his son, then at the post, Raph, Leo and Mikey's had kept going, but he hadn't measured Don in a long while. Sitting down he was shorter than the last mark they had made. He sighed, it wasn't really about who was tallest, but it wasn't fair to not measure his son's growth just because he couldn't stand.
"Hm, let me think about it."
Later they had concluded that due to lack of measuring tapes, they would simply lay him down and with other objects get the height, then Splinter could put it on the post so he could at least get a gist of how tall he would be if he stood up.
When all was said and done, Donnie was beaming, while Leo looked less thrilled. Don's mark was higher than any of the others on the post.
"See? Not shortest." He said when he was sure Splinter was out of hearing range.
Raph gave Leo a dunk in the back. "No, that'd be Mikey."
A few years later though it seemed more and more like Raph was going to claim that spot. While Donnie's height kept staying well above the others. When they were younger Leo was definitely guilty of being glad Donnie sat down all the time so it didn't show. As they grew older though he stopped caring about it completely, realising height was after all, not really important.