Speaking to a Rabbi recently he told me the rules of Bishul Aqum have more to do with preventing intermarriage than risk of non kasher ingredients being added to food without a Jew's knowledge.

Let's say someone has a Jewish mother and non Jewish father and has half siblings through the father. These siblings are not Jewish, but if one was raised with these siblings and viewed them as family, do the rules of Bishul Aqum apply to these siblings and make it forbidden to eat food cooked by them since there's no risk of intermarriage?

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    Do we have any examples of subjectivity in this regard? It's not like male gentiles don't effect Bishul Akum for male Jews – Double AA Nov 20 at 20:21
  • Strictly according to the halacha a Jewish man isn't even related to his non-Jewish children, so, family considerations aside, I don't see how half-siblings would count as half-siblings as far as halacha is concerned. – Josh K Nov 20 at 21:00
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    In such a case where darkei shalom absolutely applies, it seems one could rely on the Rama's ruling l'chatchila regarding fire and possibly the Rashba's(?) ruling not requiring fire in a Jewish house(this needs more investigation since the father is not Jewish). See Shulchan Aruch Yoreh Deah 113:4, 6, & 7. This needs the judgement of a competent and understanding posek. – chacham Nisan Nov 20 at 22:08
  • There should be no reason to allow it (barring other considerations - perhaps darchei Shalom). You don't need to think up lots of examples where there is absolutely no reason to think that Jew X would have relations with non-Jew Y, and still it would be forbidden. For example, can a ger eat his parents' food made by them, even if kashrus considerations were not relevant? No. The intention of Chazal would be a lo plug - even when the reasons don't necessarily apply. Also, it would only help for the persons concerned - the food would be assur to Jews outside of that circle? – user18155 Nov 22 at 8:27

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