Nick Lachey had told Extra that he wants to be a dad
"I'd like to believe I'll have a family and have kids of my own. For me, it's what I look forward to more than anything else." 
As for whether that future family includes Vanessa Minnillo, the lady Lachey has been spending a lot of time with, he would only say
"She's a great friend. I'll leave it at that." 