Todomomo

Rei: she babbled along to Momo's singing when she was the only child
August: he laughed everytime someone looked like they were singing. (Stretches out face, closed eyes, hand on chest.) he doesn't know when they're singing becaUse he can't hear it, but he can tell when they're singing and he absolutely loves it.
Hino and Haruhi Slept in the same bed for two years.
Eve laughing is adorable.

Kirimina

Akane and Iro roller skating holding hands so the other twin doesn't fall.

Miruhawks

She and Meg used to bathe together. When they were tiny tiny babies. Dove would laugh everytime and those sink baths were amazing. Ryuko and Rumi stopped doing it when they turned 2.

Iidamei

Tameiko would get really happy everytime her mother and her made something that didn't explode. The entire family worked on a car together, it didn't explode either!

Kamijirou

They had a family band.

Dabi x Toga

When a Roman was a baby, he and Dabi messed around. Dabi would set his hand on fire, Roman would try and touch it, and Dabi would extinguish the flame. It made Roman laugh and Roman laughing is horrifying but adorable at the same time.

Nejitama

The kids are cute but the cute things they did was Amai actually helping her brother with bullies. She fought a bunch of kids. "ONLY I GET TO MESS WITH MY BROTHER" was the only thing running through her head. She didn't win but she felt good for fighting. 

Mt.Kamui

Okuri and Kamui would do father daughter dances and she'd stand on his toes

Ryushot

Megami would sit on Shinya's chest and pull at his hair.

Daenerys couldn't crawl for a while, so she scooted on her belly to her mom and she'd drool a bit.

HitoRei

Rosalind would cry, see Shinsou, then her eyes would go wide and she'd stop crying and start giggling. When Reiko does it she screeched like a banshee, don't test Rosa.

Tetsukendou

Sleep is adorable.