Relationship / re-marriage question...

tsmomma42

If you're involved in a serious relationship what does your DC call your significant other? My son is 2. He has a good father who is active in his life. I'm engaged. I've known my current partner for about 6 years but we haven't dated that entire time. My son calls his father daddy (obviously, lol). He has started to call my fiance dada-name. At first I tried ignoring it and using my fiances name more often but he kept doing it so I made a point of saying "Nope. That's no daddy. That's XXX." every time he did it. He's still doing it though. Any tips to get him not to? I'm sure his father wouldn't appreciate him calling my fiance daddy. I've thought of trying to get him to use a nickname but I'm not sure what. Also, should I give his dad a heads up that he has been doing this and that I'm trying to correct it or just let it be?