really? my step-sons call thier mothers boyfriend daddy all the time. it drives me nuts but my husband doesn't seem to mind.YOU CAN LOSE CUSTODY. You might not think kiddo calling your husband "daddy" is a big deal. Her father might not care. But it happens - the NCP changes his/her mind and starts to push the issue....and if the CP refuses to rectify the situation (ie, kiddo has to learn that she has one Mom, one Dad and one Stepdad) the CP can lose custody to the NCP. It has happened.