Question about that "Little People, Big World" show.

[Rain Man]

I've only seen a couple of episodes of this show, which is about a family of "little people" (dwarves, I think).

I'm quite confused. I saw the show once this year and once last year, and I sure thought it was the same set of parents. However, last year the family had two sons who were dwarves and one adopted daughter who was a dwarf.

I saw it again this year, and they've got a dwarf son, two normal-sized sons, and a normal-sized daughter.

Am I mixed up? Did they switch families? If they did, the two sets of parents sure look alike and sound alike.