Doctors worried that , due to her cerebral palsy , PERSON@1 would never be able to speak or use sign language to communicate with her deaf sister , but after production of the first volume , PERSON@1 began to sign , and later , to speak .

Doctors worried that , because of her cerebral palsy , PERSON@1 would never be able to speak or use sign language to communicate with her deaf sister , but after the first volume was made , PERSON@1 started to sign , and later , to speak .
