Writing "in in" is awkward, and the more common preposition with "childhood" would be "during": This is the house which he lived in during his childhood. edu/owl/resource/594/01 /
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emilkyA chain of “ in ” in this sentence makes me feel strange.Well, it is strange, but it's not wrong. That sort of thing happens from time to time in English, and writers usually try to avoid it by thinking of a different way to express their ideas, but it's not wrong.