It is not correct to draw an analogy between donating blood and breastfeeding to prove that someone is a mahram

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Is the husband’s mother a mahram to the sons of his wife?
Wife and Husband's Brother

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Related Answers:
Maternal uncle marrying the daughter of his sister’s son
She breastfed a child thinking that it was her son; is the mahram relationship through breastfeeding established?
Being married to a woman and her father’s ex-wife at the same time
Is the husband’s mother a mahram to the sons of his wife?
Wife and Husband's Brother

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