ANSWER: If he gave you his name and your mother was not married to anyone else and was not known to have slept with other men at the time, he is your biological father and he must provide for you and you will inherit him if he is Muslim 

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ANSWER: He cannot inherit his biological father unless he had married his mother and gave him his name. 

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ANSWER: She was born out of wedlock and hence she is not your sister. However, you can’t marry her just to be safe but she is not your mahram. 

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