Final answer:
The correct answer is 'sobrinos'. 'Sobrinos' means nephews or nieces.
Step-by-step explanation:
The correct answer is sobrinos. In the given sentence, 'Los hijos de mis tíos son mis'... (The children of my uncles are my...). When referring to the children of one's uncles, the correct noun to use is 'sobrinos' which means nephews or nieces.
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