How to create a Chinese Language Ecosystem?

1. https://cebilingual.org/page/2/
2. https://cebilingual.org/2015/10/31/dear-parents-of-toddlers-and-preschoolers/
3. stages
   1. Stage 1 (priming): 0 to 4 years old.  Difficulty level: moderate
   2. II.  Stage 2 (Induction): ~ 4 to 8 years old.  Difficult level: high
   3. III.  Stage 3 (Consolidation): ~8 to 12-14 years old.  Difficulty level: extremely high.
   4. IV.  Stage 4 (maintenance): ~12-14 to 18 years old.  Difficulty level: medium.
   5. stage 5 or dormant stage, with typically gradual regression in Chinese proficiency

https://youtu.be/TudoQfzdK9Q

1. Non Speaking -Non Heritage Parents?
2. Non Speaking Heritage Parents ?
3. One Chinese Speaking Parent?
4. Both Chinese Speaking Parents?