Below is a list of additional resources that parents can use to learn or improve their own Cantonese. Some of the content creators below also offer classes or patreons to further extend your learning. I am not affiliated or endorsed by any of these creators. I have wrote a brief description of their website below and have tried to be as accurate as possible. If there are any errors, please feel free to let me know.
Cantonese for Everyone (I have two brand new copies of Cantonese for Everyone available. Can arrange a meet up within the GTA in Ontario, Canada)