They have nine kids (they had ten, but Kim ran over one with her car and killed him. Really.)
Of the four adult Plath kids, only one remains in the IBLP fold: Hossana Plath Noble, married to the fundie famous Timothy Noble. Ethan, Micah, and Moirah have all left fundiedom. Ethan married a fundie lite woman named Olivia, who gradually got Ethan to realize how badly he'd been abused. Their happy, stable life inspired Micah and Moirah to leave fundie ways behind, which resulted in Kim kicking their asses out before they turned 18.