Given the following context:  Ultrasonic tells the tale of Simon York – music teacher, married, soon to be father. Simon plays in a band and dreams of one day getting paid to write music. For now, however, money is tight and Simon shelling out $2000 to record an album is an additional cause of stress on his marriage to Ruth. Jonas is Ruth's troubled brother and spends his days handing out flyers and trying to, "open peoples' eyes," to his theories of conspiracies and injustices in the world. One night Simon hears what he thinks is a very real sound in an alleyway. The sound does not disappear and remains audible from his house. Ruth doesn't hear it and she dismisses it, claiming that his ears are ringing from years of loud music. Jonas' reaction to Simon's ailment is much different than Ruth's. Jonas believes Simon and, after doing some research, believes that what Simon is hearing is in fact a government experiment, which utilizes an ultrasonic auditory signal to control the minds of all who hear it. Simon, with some prodding from Ruth, goes to visit an ear doctor who informs him that his test results show Simon's hearing to be least 6,000 Hz higher than the average human. This convinces Jonas that his theory is correct, and the two of them embark on a journey to get to the bottom of the sound experiment and stop the noise.  answer the following question:  Whose sister persuades the music teacher to have his ears checked?
The answer to this question is:
Jonas