Board Thread:Theories and Rumors/@comment-30938718-20171124173629/@comment-35373528-20180103223910

Yes, but many people have wrote that it was non-canon. There was a non-canon master of water (thankfully non-canon for Nya) And we're not taking about him as a relative to Kai and Nya.

This time ninja is non-canon AND was created at least 4 years before season 7.

To sum it up, tome ninja is a non-canon character so he is not realeted to characters in the show.

That's just my thoughts though.