The child function is the one that the INTJ shows to the person they love.

 In the case of an INTJ, the child function, often known as the tertiary function, is the introverted feeling, Fi. It is an inward function. It is concerned with one’s innermost feelings and desires, This makes the INTJ more intense with their emotions. This intensity makes expression of the emotion quite difficult. Reason why many INTJs find it difficult to express their emotions.
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