Sentence:  This also implies that the initial dichotomy - the mother tongue as the language of affect as opposed to the <WSD>father tongue</WSD>, as the language of cognitive development -- needs to be questioned and redefined in the context of diasporic experience, maybe as the language one lives in as opposed to the language one works in. 
Meaning of the word marked with <WSD> tags:  A separate language for expressing ideas, as opposed to the vernacular (mother tongue) which is employed for everyday common speech.