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If he considers himself as Serbian then I would also consider him Serbian.
In real life when I told about where my family lineage is from, only two people did not consider me as not an ethnic Turk. Of course they were not in an offensive way, they just asked me whether I am not not ethnically Turkish but Bosniak. Not a big deal for me. As for Mortimer’s case, things might be different among Serbs.
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