I dunno, do you want to adopt a child? I think that's the main element of the add-on.
The houses in the base game might be beautiful and all but in Hearthfire you can build your own homestead the way you want, you can know actually create a living family by adopting your child by actually being a mother/father now.
guess wat!?My dad 2day is buying hearthfire yay i have all of em now!