The title of the film "At home among strangers, a stranger among friends" was translated, according to Wikipedia, as "At Home among Strangers", "At home among strangers, a stranger among his own" or "A friend among foes, a foe among friends" ... By analogy, "one among one's own" can be "at home among his own" or "a friend among friends", but here it is also not as universal as in Russian.
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I got it: https://www.imdb.com/title/tt0072231/?ref_=nm_flmg_act_32