His uncle is not a legal guardian. Legal guardianship refers to the guardianship directly stipulated by law. Parents are guardians of minor children.
 If the parents of a minor are dead or have no ability to supervise, the following persons with the ability to supervise shall act as guardians in order: grandparents, maternal grandparents; Brother and sister; Other individuals or organizations willing to act as guardians, provided that consent is obtained from the neighborhood committee, village committee or civil affairs department in the place where the minor resides.
 [Legal Basis]
 Article 27 of the Civil Code states that parents are guardians of minor children. If the parents of a minor have died or are unable to supervise, the following persons with the ability to supervise shall act as guardians in order: (1) grandparents; （2） Brother and sister; （3） Other individuals or organizations willing to act as guardians, provided that consent is obtained from the neighborhood committee, village committee or civil affairs department in the place where the minor resides.