Katie is shocked when Stephanie informs her that her father is carrying on with Pam. Stephanie continues to tell Bill and Katie that not only has Stephen gotten Pam to fall in love with him; but they’ve moved in together, too. Bill and Katie have a hard time believing Stephanie but Pam arrives and soon confirms that her relationship with Stephen is true. Pam further shocks her sister when she admits that she and Stephen slept together. (thetvdb.com)