User blog comment:1seddiefan/Why don't the writers mention Sam and Freddie's dads?/@comment-2212138-20100902014439

I do agree that Sam's dad walked out on her mom at some point, quitely likely partly because he didn't wanna have kids.

As for Freddie, I'm getting annoyed that everyone is automatically asuming that his father left or died. For me, there is a very obvious, very possible third possiblity: Maybe his mom never had a boyfriend or never got married (That wouldn't be very surprising considering how crazy she is), and maybe she still really wanted to have a child, so maybe she got...er...a "donation", if you know what I mean, and that's the reason she's so protective over Freddie: Because all she techinquely cares about is kids. And that would also be the answer that they never talk about having a father.

Now, there's a possiblity it could've been the same solution with Sam, but I think it's a lot less likely because her mother appearently treats her like crap all the time, and what's the point of having kids if you do nothing but treat them like trash all the time?