No, you would not have any rights, unfortunately:1) First, nepotism is legal--unfair, but legal. It is permitted to hire friends, family, family of friends, etc. instead of  other qualified applicants.2) Second, meeting the criteria for a job, passing any checks or tests, etc. does not create a right to the job.3) IF the employer had actually offered you the job or promised it to you, and when doing so, had known you had other job offers, and in reliance on that promise, you turned down the other offer, that might give you enforceable  rights under the theory of promissory estoppel. But if the employer never actually promised you the job, then there is no promise to enforce; and even if the employer had promised you a job, if he did not know you had another offer which you would turn down, his promise would not be binding anyway.