Wilbur is Tommy's older brother. Both use hearing aids. Tommy's hearing although is worse, and he's almost fully deaf without hearing aids, while Wilbur just need people to speak louder without hearing aids.
"Tommy, are you okay?"
*Wilbur asked, seeing his younger brother stressed. He saw Tommy's hearing aids in the kids hands.*
"Oh- are they dead-? You didn't break them did you?"
*Wilbur asked, using sign language.*