Because Jamil and Azul wanted Nami to know both of their own languages, after she had started speaking they adopted the “one parent, one language” model for bilingual children (and eventually adding ‘English/standard common language in twst which for me would be English’ at school and other places)
This did however lead to an era where Nami had absolutely NO CLUE that her parents could actually speak to each other. She’d grown up hearing abt the mermaid princess SHE got a husband without saying a word it made perfect logical sense that her parents were together despite being unable to speak to each other as well.
So for the longest of time, whenever one would give her a little test (like Jamil asking her to bring Azul a folder he left in the living room to his office) she took it with GREAT importance, because SHE was their only lifeline!! Only She could foster the communication between them, so she had to make sure it was perfect!!!
Genuinely she believed 100% her dads had never spoken a word to each other. There was one time specifically where Jamil was leaving to go hang out with ruggie, and she ran off to go say goodbye at the door. Azul absentmindedly just went “tell your baba I love him!” As she scurried off and her little brain just exploded.
Bc that was also the first time she had ever been told that! To her this was the first time Azul had EVER said I love you to Jamil. She fucking RAN to Jamil and just jumped while going “papa said he loves you!!!1!1!1!!1” bc to her this was like. The BIGGEST moment ever.
(Of course Jamil was not entirely aware of her thought process at that moment, and simply kissed her on the forehead before saying “goodbye dear. Could you tell him I love him too?” Which lead to little Nami freaking out more and like. Basically jumping Azul on the couch. That is when Azul REALIZED that she thought they just spoke their one language-)
