这是我哥 这是我小哥
“This is my eldest brother. This is my second brother.”
THE DIALOGUE REEL
干吗
“What are you doing?”
这是我哥 这是我 小哥
“This is my eldest brother. This is my second brother.”
“This is Zheng Shuran, my boyfriend.”
Direct spoken expression in this communicative setting.
Chinese kinship terms strictly distinguish birth order and seniority, often used directly as forms of address rather than personal names.
LEARNING CHUNKS & PARTICLES
younger of the older brothers / younger brother (or friendly address for a young man)
Within families with multiple elder brothers, '小哥' specifically identifies the younger among the older brothers.