It is notable that Tsuruko is actually Motoko's biological sister as they are two of the few characters in the series who are siblings by blood relation (the second siblings couple is presented by Kaolla and Amalla Su).
Tsuruko is actually Motoko's biological sister. They are two of the few characters in the series (the second siblings couple is presented by Kaolla and Amalla Su). This is notable. This series are siblings by blood relation.