Dear Rishi,
As far as I know, if the director is an employee of your organization, what I mean here is that he/she should not be an honorary director or, in some cases, a professional director as mandated by SEBI. In that case, gratuity is applicable to him. I request you to refer to the gratuity law for a better understanding of it. It's better to collect multiple opinions on it.
Regards,
Jai