So if I understand this corrcetly, your brother is in employment of an MNC. Please check as to what date is mentioned in the contract for commencement of his services in the Company. That is not an issue here it seems. However, you have not mentioned if your brother had signed any bond wid the company. Please elaborate if this service agreement for 2 years was actually a bond. If yes, whethere your brother had deposited any money with the company and in turn they had provided training to him. Generally in companies (without bond) there is notice period clause which one needs to invoke before one’s services are relieved from the company.

Having said that, it is reasonable that your brother cannot carry on the job due to his problem.