wanting your sister to smile more, good on you, berabara, i understand well what you say,
i know an older deaf and mute person, he'd learned some speech, that sounds very musically
he used to drive his french-licence-free car while honking all the time

he couldn't hear that but everybody knew when he was coming

and among my french friends, those whom are teachers just need to tell me everytime that i don't speak french very well, as if i don't know, it's very un-encouraging!
and being born deaf is hard to learn speech deaf people use sign language I know some but I speak very well been told my parents and friends I speak very clear voice I talk fast when I'm excited lol that's just I'm steven that's all yeah speaking new language would be very hard to learn takes awhile like i need a helper special needs teacher or support teacher it's called assignment or something like that