She doesn't know if he's
her brother or not ?!
The phrasing of the response drew widespread attention and criticism for that exact reason. Political commentators, critics, and media outlets noted that a question about whether a spouse is a sibling typically prompts a definitive no rather than a qualified not to my knowledge.
The situation has been interpreted from different perspectives:
Critique: Critics, including political opponents, argued that the open-ended phrasing was evasive, fueled further speculation, and failed to definitively put the long-standing rumors to rest.
Defense & Context: Supporters and defenders often argue that the response was a manifestation of frustration or a rhetorical brush-off to a question she has repeatedly dismissed as absurd and offensive. They maintain that treating an accusation she views as a conspiracy theory with a formal, literal answer is a byproduct of being asked hostile questions.
Ultimately, the ambiguity of the phrasing is precisely what kept the exchange in the news cycle, as it left room for continued public debate rather than providing a clear-cut resolution.