With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Biographer Clarice Stasz and others believe London's father was astrologer William Chaney. Flora Wellman was living with Chaney in San Francisco when she became pregnant. Whether Wellman and Chaney were legally married is unknown. Stasz notes that in his memoirs, Chaney refers to London's mother Flora Wellman as having been "his wife"; he also cites an advertisement in which Flora called herself "Florence Wellman Chaney".
text_B: Without being able to see actual tax records, which would probably not be released to a curious journalist or researcher, could you still say from this passage that Wellman and Chaney were able to file a joint return?
NO.