My daughter said daddy and I don't say that to her either b/c her dad is just a paycheck really... he hasn't seen her since last June and only because he came here to give me my stuff and his mom wanted to meet her (sucks that she misses out b/c of her son b/c she is really sweet)
Anyways, she said daddy so I actually showed her a pic of him (her dad) and she said daddy, I showed her a pic of my best friend Jarrett and she said daddy... she just knew daddy was supposed to be a "boy"... then I started paying attention and found out that she learned daddy from Dinosaurs, ya know that old tv series with the baby Sinclair that says not the momma (some are kid-friendly episodes lol)... so that's where she learned it.
Could your little boy be picking up the concept of "daddy" from a show or relative or friend? That's what I would guess. My daughter went around calling every guy (even stranger guy hikers when we'd go hiking with her lol) daddy... I had to teach her that guys are not "daddy"... but I didn't teach her who hers was because he isn't in her life, even though he got her name tattooed on his arm (*rolls eyes*).. I hope my daughter will answer the would you live with dad question like mamyof2's daughter. I won't talk bad about him, but I won't talk good about him either... I am just neutral :P