Dororo was glad to have a permanent family. Jukai treated him quite well, showing him his robotics, making hot dishes for him like curry rice with sweet potato, and remembering to use his preferred pronouns (most of the time). Jukai was a great dad.
Hyakkimaru, his brother, on the other hand, didn't interact with him much. It wasn't that his older brother didn't like him, but he always seemed so solitary and his handicap created a bit of a barrier between them. One day, Dororo went to pay his brother a visit. He seemed to have been doing homework, but Dororo couldn't read the braille textbook to figure out what subject he was working on.
"Hi." said Dororo, "I know you can't hear me, but I just want to get to know you more."
Hyakkimaru said nothing as he continued his homework.
"Dad says you're adopted too. I guess that's something we both have in common."
Hyakkimaru just continued his homework.
"Are you able to speak at all?" asked Dororo, "I can teach you."
Dororo took Hyakkimaru's hand and placed it on his face.
"I'm Dororo. Do-Ro-Ro." Dororo placed Hyakkimaru's hand back on his face, "Now you."
Hyakkimaru said nothing.
Jukai came into the room.
"Dororo, leave your brother alone. He's busy."
"I was only trying get him to say my name." said Dororo.
"Hyakkimaru is self-conscious about speaking, Dororo." said Jukai.
Hyakkimaru then turned to Dororo, took his hand, and started signing into it. Dororo was quite confused.
"I thinking he's giving you your sign name." said Jukai.
"Sign name?" asked Dororo.
"Deaf people give each other their own signs that they use as their names." said Jukai.
"Oh."
Dororo took Hyakkimaru's hand and started signing back. Hyakkimaru just went back to his homework.
"What did I do?" asked Dororo.
"I think you just called him 'Toothpaste'."
"Oh." said Dororo.
"We'll teach you. Don't worry." said Jukai.