Toneri's father was named Mutsuto... By then, he was already terminally ill.
According to Mutsuto, his ancestors had been custodians of the historical records and secret treasures of Hamura's descendants.
For an isolated people like the Ōtsutsuki Clan, history represented their civilization and accumulated knowledge, and their records contained many important things.
For that very reason, Mutsuto's family had been spared for the time being, but the descendants of the Hyuga Clan at the time had imprisoned them.
Several years earlier, Uchiha Izuna's reincarnated body had found the teleportation point connecting the earthly world to the moon and, through a twist of fate, rescued Mutsuto's family.
Uchiha Izuna was a powerful shinobi left over from the Warring States Period. He had ventured onto the moon alone, but he had not acted rashly at first, merely investigating in secret.
Uchiha Izuna had personally witnessed the abduction of the Hyuga Clan members back then.
His investigation revealed that the first group of Hyuga Clan members to reach the moon had all died. The new generation ruling the moon consisted of descendants with mixed Hyuga and Ōtsutsuki blood.
These descendants held utterly deranged, bizarre beliefs. They could not be reasoned with, and their dispositions were vicious and brutal.
When Uchiha Izuna discovered what those Hyuga descendants had done over the years, he was furious. He intended to purge their ranks in his capacity as the Second Hokage.
Those descendants of the Hyuga Clan did not recognize Konoha, much less Uchiha Izuna, a village leader imposed on them from outside. They also upheld their supposed "ancestors' last wishes" to destroy the world created by the Sage of Six Paths.
The Ōtsutsuki Clan, who should have been the ones wanting to "destroy the world created by the Sage of Six Paths," instead saw Earth as