As a journalist, William Gee Wong focused many of his stories on the Asian American experience. And in his new memoir, “Sons of Chinatown,” Wong trains his reporter’s eye on his own family’s sometimes uneasy immigration and assimilation story. It begins in 1912 with the immigration of his father, known as Pop, who came to the U.S. as a “Paper Son,” an individual who purchased partially fraudulent documents to establish residency. Over decades, Wong’s family established a foothold in the United States, but never managed to fully escape discrimination and racism. We talk to Wong, a former Wall Street Journal reporter and columnist for the Oakland Tribune and San Francisco Chronicle, about his family’s story.