My half sister wants to Petition court to reopen my motherís estate in my deceased fatherís behalf so that she and my half sisters and brother can be part of a wrongful death settlement of my mother. I believe she entered a class action suit against the makers of the drug Avandia, without my knowledge. I did asked to see the medicine that my mother was given and was told that the bottles were gone and I shouldn't do anything because my father had the same doctor as my mother, since he was alive then. At that time, I didn't feel like arguing so I dropped asking about the medicine and returned to my home in Illinois. I was not told about the settlement claim until I received documents from the lawyer she hired. Once my sister found out she had to include me to collect, the lawyer sent me documents to be a joinder in the Petition to open my motherís estate and to sign making her the Administratrix. ( My mother died in May, 2008, of a heart attack, while in the hospital. My father passed in Sept. 2012) These documents didnít state I was my motherís only son and her blood relative, or does it mention that they are her step-children. I can't trust my half-sister because of her pass action, so I did not sign. What I would like to know is, would the step-children in a case like this, get equal shares even if I am the only child of my mother and what steps should be taken next?