If anyone was wondering I made a "daddy counter" for persona 4 that has every instance of the word "daddy" I could find by looking up the game's script. I only found it 4 times, as follows:
1. 6/15 Ai Ebihara: “My daddy made a fortune in land speculation.”
2. 7/14 - Nanako: “Daddy doesn’t come home because I’m not his ‘real’ daughter?”
3. 9/07 - Smirking Student: “And doesn’t she look like she’s got a sugar daddy or two?” (talking about Ai Ebihara)
4. 9/24 Nanako: “Daddy, big bro, hurry, hurry!”
Interestingly, the word daddy was only used 4 times in Persona 4. This was probably a conscious decision because 4 is present in the title of the game.