Setsuna is Ranma’s biological mother due to the fact that he grew up in a different reality she can no longer look into his past, nor the past of his adopted sister Aeris. Which was why she was so surprised when she was given his Juban High placing exam as well as the fact that he wasn't dead or at the very least crippled for life. Even though he had changed his name Setsuna knew he was her son and as she waited for Ranma to come into her office. Setsuna wondered what Genma had done to have Ranma renounce the Saotome name or even if he had anything to do with Ranma's upbringing.  

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