Hot answers tagged family-members
R' Moshe Feinstein addresses your question (Igros Moshe YD I §54). He says that they are not believed under the category of eid echad ne'eman b'issurin (עד אחד נאמן באיסורין - "a single witness is believed to relate whether something is a forbidden item")1 since they don't keep kosher. However, he also says that if you know from extensive experience that a ...
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