Your post does not have enough information to give you a complete answer. Do you have any written agreement with the other tenant in common? Was the house the homestead of the decedent? Are you paying rent for your exclusive use of the property? You should consult a lawyer in your area who is experienced in both real estate and probate for guidance on your rights and responsibilities.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.