Wu Wei
ursus senum severiorum and ex-Bisy Backson
I read that it's related to both Cantonese & Mandarin.
All Chinese dialects are related by written Chinese but many cannot actually speak to one another. And admittedly I am no expert on origins of dialect, I have not seen Mandarin as related to Yue or Cantonese. Yue and Cantonese being Southern dialects and Mandarin being a Northern dialect. But I am no expert so I could be mistaken.