What to call SD to DS?

achase123

We have a court date on Thursday and SD will be requesting supervised visitation with P to be reinstated.  I am fine with this and we have agreed on two, one hour visits/week, supervised by me at first, and then by a court appointed supervisor.

My question is, what should I call SD when introducing P to him?  I ask this because I hesitate to be like "oh this is daddy!" in case SD decides to begin using drugs again and disappears.  I worry that could be traumatic for P to think "daddy" was around, and now he's not.  I have thought about introducing him with SD's name but I don't know if that's too weird. 

Any thoughts, ideas?