What do I do if my family members steal my inheritance?

My step-father and mother had a will together in the state of CA. Less than a month after his death, my sister called and asked for my social security number and gave me a fraudulent reason why she wanted it. 8 years later I found out that my mother had used it to set me up with a trust fund that my step-father did not agree to. I don't know if he left me something I was to receive upon his death or not, but I would consider this to be fraud, identity theft and theft, as well as domestic violence, sabotage and treason. My mother and sister have always been this way since I was 3 and it has caused me Traumatic Stress Disorder and a feeling of insecurity and lack of safety in the world. Don't give me a dumb answer. I want a straight shot. - Is this your question? Add additional information