In traditional Chinese culture, the family structure is strongly patrilineal, meaning lineage and inheritance are passed down through the male line. Relatives sharing the same surname and paternal grandfather were considered part of the core family unit. The term “堂” (táng) reflects this deep-rooted concept. Your `堂` cousins are considered your “hall” cousins—part of your primary clan.
This contrasts sharply with Western culture, where the single word “cousin” is used for all children of your aunts and uncles, regardless of gender, age, or whether they are from your mother's or father's side. The Chinese system requires you to know four key pieces of information:
1. Lineage: Paternal (`堂`) or Maternal/Other (`表`)?
2. **Gender:** Male or Female?
3. **Relative Age:** Older (`哥`/`姐`) or Younger (`弟`/`妹`) than you?
* Using the correct term like "堂弟" is a sign of respect and acknowledges the specific hierarchy and relationship within the family, a core tenet of Confucian values. It shows you understand your place and their place in the family structure.