Lewin has entire photo albums of Rin growing up. He loves showing them to Ryuji.

Lewin shows them all to Ryūji because that’s what traditional dads do and then Rin lights on fire and tries to burn it and they chase each other around the apartment because “DAD, YOU JACKASS, STOP SHOWING HIM MY BABY PICTURES.”

"But you were so cute playing in the bath at Grandma's house!" Lightning called back. The man hopped out the window and Rin did too. Unfortunately, Lightning didn't have the ability to jump far distances easily, so he was caught on the roof of a building when the gap between it and the next building was too wide.