This is so sick. I live in SF and this is becoming common

My mother has a house she has been renting for over 20 years to a blind man. My sister is going to inherit this house. Her husband is threatening me to take over my mother's conservator ship because I won't raise the rent or improve the rental property. I spoke to the lawyers yesterday and they told me that my brother in law can't go after me. After reading this there is no way I am going to evict the blind man. Let my sister and husband be the villains when she inherits the house.