Вопрос:

Transform the word in brackets so that it fits the sentence lexically and grammatically. He is of mixed English and Italian (PARENT).

Ответ:

The word in brackets needs to be transformed to fit the sentence lexically and grammatically.

The correct word is: parentage

He is of mixed English and Italian parentage.

Translation: У него смешанное английское и итальянское происхождение.