Thank you for your question. I am sorry for your loss. I am presuming by your question that your father died without a will, also known as passing "intestate." Distribution in such cases is determined by statute. In such a case, since neither you or your sister are related to your step-mother, under Colorado's laws of intestate succession, she would receive $100,000 plus half of the estate; you and your sister would be entitled to the remainder.
You can read a brief summary of the intestacy law here.
I would suggest speaking with a probate lawyer in the Colorado area regarding this matter further.
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