I don't think any of the sisters know who Aleida is, even for Akiha who saw her face. Because Akiha couldn't recognise Aleida as anyone besides the lady in her dreams, she may actually not be their mum.
It would be really difficult to forget how your mum looks like lol and if they know Aleida is their mum, I don't think Takane and Kazane would be fighting her like an enemy.
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