Serving the Mother-In-Law Who Is Paralyzed

My mother-in-law fired my nanny who paid NT$5,000 per month. Volunteered to take care of my paralyzed mother. But he used the waste oil from the range hood to cook for my mother. He didn't turn on the air conditioner during the hot summer days, which caused my mother to suffer from heatstroke and coma. He even secretly replaced the special medicine my mother was taking to maintain body functions, which resulted in my mother being sent to the ICU. I originally thought that these were just unintentional mistakes of the older generation who were too frugal, but I didn't expect that the mother-in-law had her own plans...