Is a marriage contract valid if its wording was as follows: First scenario: The groom's guardian said to the bride's guardian (maternal grandfather): "Marry your daughter So-and-so to my son So-and-so," and the latter replied: "I have married her to him," knowing that the bride is the daughter of his daughter and that the bride's guardian has a biological daughter with the same name as the bride? Second scenario: The groom's guardian said to the bride's guardian (paternal grandfather): "Marry your daughter So-and-so to me," and the latter replied: "I have married my daughter So-and-so to your son So-and-so," knowing that the bride is the daughter of his son and that the bride's guardian has a biological daughter with the same name as the bride? If the answer is that one or both of them are invalid, how should the Imam deal with the couple, knowing that they believe the contract to be valid, and what is the correct wording in both scenarios?