Why does everyone call Leslie Cheung "brother"?

There are three theories: 1. When filming "A Chinese Ghost Story", Joey Wong called Leslie Cheung brother. 2. When filming "The Legend of the White-Haired Witch", Brigitte Lin once put on makeup. Leslie Cheung who was standing aside joked, "Wow, sister, you are so beautiful." Brigitte Lin replied, "Brother, you are so handsome (handsome)." From then on, the crew and staff Brigitte Lin called her sister and Leslie Cheung brother, and it spread since then. 3. "Brother" was originally the name that everyone called Leslie Cheung's beloved Tang Hede. Because Carina Lau mistakenly called Leslie Cheung "Brother" at a party, which made everyone laugh. Carina Lau simply made the mistake and the nickname "Brother" spread from then on.