In order to determine whether you have any interest in the house and land, you need to know how title was held. For example, in Arizona, if title was held by your mother and stepfather in joint tenancy with right of survivorship, then upon your mother's death, the entire house would pass to your stepfather's side of the family. If the property was held as tenants-in-common, and your mother did not leave a will, you would most likely be entitled to one half of the interest in the property. As the estate is outside of Arizona, you should definitely contact a probate attorney in the state where your mother lived.
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You need to have the entire situation reviewed by a probate attorney in the state where your mother and stepfather resided, at the time of death. The title to their assets as well as the presence of any estate planning documents will dictate the answer to your questions.
I am very sorry for your losses.
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Depending on how the property was titled when your mom died, you may have to open a probate estate to clear title in the real property in the state where the property is located even if it is different from where they resided when they died. An experienced probate atty can help you on this matter. Good luck.
Legal disclaimer: This answer does not constitute legal advice. I am admitted to practice law in the State of Missouri only, and make no attempt to opine on matters of law that are not relevant to Missouri. This answer is based on general principles of law that may or may not relate to your specific situation, and is for promotional purposes only. You should never rely on this answer alone and nothing in these communications creates an attorney-client relationship. less