Why only men of Zhuang nationality have the right to inherit?

Zhuang people's marriage takes the form of free love and arranged by their parents. Generally, they enjoy full freedom of love before marriage, but parents often interfere with arranged marriage. Zhuang people generally practice monogamy. Women, like men, are family laborers, but only men have the right to inherit. In its marriage system, "staying at home" or "sitting at home" prevailed, and this custom is still maintained in some places. After the young men and women get married, the bride will return to her parents' house to live in her husband's house for a short time during major festivals and busy farming seasons, and will not stay in her husband's house for a long time until she is pregnant. Therefore, the time of "staying married" varies from three to five years. In history, there was sexual freedom during the period of "never leaving one's husband's home", but in modern times, influenced by Confucian culture, it was considered as an improper behavior, which was strictly prohibited, and offenders were either divorced or compensated for certain property. Now love is free and marriage is independent

This is a custom.