Who is lefty in dragonwings?

In "Dragonwings" by Laurence Yep, Lefty is the nickname given to the character who is the main protagonist's father, a Chinese immigrant named Windrider. He is a skilled engineer and dreamer who aspires to build a flying machine, reflecting themes of ambition and the immigrant experience. Lefty's character embodies resilience and creativity as he navigates the challenges of life in early 20th-century America. His relationship with his son, Moon Shadow, is central to the story's exploration of family and cultural identity.