Rasuki Ōtsutsuki is the daughter of Hagoromo Ōtsutsuki or the Sage of the six paths. Her father had asked her to watch over the Jinchurikis leaving her with all 9 yang version of the tailed beasts.She also was sent to over see her brothers reincarnations.
Tsukiko is the daughter of Itachi and Reika Uchiha. Itachi and Reika were lovers before Itachi killed the Uchiha clan leaving Sasuke as the sole survivor. But while Reika is giving birth to Tsukiko she dies from blood loss leaving Tsukiko motherless. After Itachi leaves for the Akatsuki he brings his daughter and they...