This goes along with what my parents did to us kids (3 bro’s total). I spent years taking care of them giving up my IT career and am now driving a truck OTR. My parents left everything (1.5M) to the Government.
Being kind does not always pay off.
Have you considered that perhaps your parents needed some professional financial guidance.
I am so sorry to hear about how your parents mistreated your kindness. My situation, somewhat similiar, hasn’t ended yet.