Hi! Thanks for the question! As your brother has been convicted for Eve Teasing Under 70 (C), it may get cumbersome for him to get a job in Govt. office as they are directed to follow the whole procedure of verification before employing a person.
However it is not necessary that he would be rejected as it depends on the intensity of the verification process undertaken by the office that you are applying for and thus it cannot be ascertained. As it is a petty case, you can even get through by proper reasoning and showing clean history otherwise. Good Luck!