User blog comment:Disney & Nick fan/Sam's Dad & Freddie's Dad/@comment-3059315-20101122013432

I get the feeling that Sam and Freddie's dad's aren't mentioned because something bad happened to them. Either they died or they left for some significant reason and won't be coming back, so I doubt they will ever appear on the show and at most they'd be mentioned briefly. I actually have considered that though. I wrote my very first fanfiction story answering that exact question.