The mother of 14-year-old Zhenya was deprived of parent

The mother of 14-year-old Zhenya was deprived of parental rights. Titov, the boy’s uncle, worrying about the fate of his nephew, decided to adopt him together with Ushakova, with whom they had actually lived with their family for five years. In the department of public education, where they turned, they were told that this was impossible to do until they officially formalized their marital relations. But even if they do, an obstacle still remains: they are too young to adopt a teenager (Ushakova is 24 years old, and Titov is 30 years old).
Solve the problem.