may not. Siblings belong to a direct blood relationship. According to Article 7 of China's Marriage Law, marriage between close relatives is prohibited, and marrying siblings is illegal.
Scope of consanguineous marriage
Consanguineous marriage refers to the intermarriage of individuals within three generations who share a common ancestor.
Starting from the common ancestor of both parties, the common ancestor is counted as the first generation, and counting down to the third generation, all within these three generations belong to consanguineous relationships. If someone marries between them, it is considered consanguineous marriage.