I am Chinese living in Bangkok Thailand since I was born. My parents are from country side Chinese in Thailand. They met each other in Bangkok and started living here.
My dad is 67 years old. Retired since he was 49. My family survives by trading gold. He does not has any kind of disease except his long eye sight. No Alzheimer. My mom is 66 years old and starts to show signs of old age.
When my mom is very tired from other housework she will call for my father's help. She has taught him how to do everything. So he knows what to do but failed to do it correctly after some time.
Specific problem:
He is purposely undercooking food in order to save money on gas which is causing me health problems (diarrhea)
Former Solutions:
1. I explained to him that I don't mind to pay for gas. It works for a short while.
2. I told him "If you are not be able to cook properly then I am not going to grant you a seed money and new wife to you". It ridiculously works longer than first solution!
Question:
I would like to know how I can aproach my dad so that he will cook things properly since it's affecting my health.