If my parents left their home to my sister who died without a Will, am I entitled to any portion?

It is not likely that you have any right to a portion of you deceased sister's estate.  Since she died without a will, he assets, including the house would be distributed according to state laws that govern this type of situation.  These laws, known as laws of "intestacy," specify who will inherit from the estate of a relative who died without a will.  For example, in Connecticut the law says that if a person dies without a will and there is no surviving spouse but there are surviving children, then the estate will go to the surviving children.    However, the laws of intestacy vary from state to state.  You should get the advice of a lawyer as to whether the intestacy laws of your state will give you the right to share in the estate of your late sister.