"Soulbrothers" is not a commonly used word. However, based on the clue you provided, it could refer to people who are not biologically related but are considered like family, often due to shared experiences, deep connections, or a strong bond.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Members of one's chosen family. Explanations are generated by AI and may be inaccurate.