THIRUVANANTHAPURAM: A case has been charged against Mathew T Thomas's wife and four members of her personal staff on the basis of a complaint that they insulted the complainant calling caste name. Mathew T Thomas's wife Achamma Alex, driver Satheesan, personal staff members Anusha, Mymoona and Susheela are charged with the case. The case was filed by Usha Rajendran, former member of the minister's personal staff. The complaint also alleges that her food was also contaminated. The police have submitted a primary report in the court.