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If the house is in your mother's name then the asset does not form part of your step-father's estate and therefore will not pass under his Will. On this basis, they will not receive an interest in the property. In order to claim an interest in the properyt they would have to establish that your father had a beneficial interest in the property, but if he did not contribute to the financing of the purchase OR paid off sums of the mortgage OR paid for improvements to the proeprty which substantially increased its value. This is quite expenses in terms of legal fees to do as well.
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