Neha Kakkar and Tony Kakkar have long been a talking point in the Indian music scene. Over the years, this brother-sister team has delivered songs that, for better or worse, always get people talking.

MUMBAI – Singer Sonu Kakkar left fans stunned on April 12 after posting—and then deleting—a deeply emotional message about severing ties with her siblings, fellow musicians Neha and Tony Kakkar. The ...