Mom guilty of allowing sex abuse A tearful Romeoville woman pleaded guilty Monday to letting her teenage son sexually assault a 10-year-old female relative, making her the third member of her now-disintegrated family to be found guilty of a felony in the case. Stepp's son, Steven Stepp Jr., now 18 and serving a 25-year prison term in the case, more than once forced the girl to have sex with him when he was 15, Platek said. The girl told Donna Stepp, but she failed to prevent it from recurring and did not call police, he said. Steven Stepp, 41, the boy's father, pleaded guilty in April 2006 to permitting the sexual abuse of a child. In exchange for agreeing to testify against his ex-wife, from whom he was divorced in May, Stepp is likely to receive a sentence of about 16 months in jail. The couple has six children. The other five were placed in the custody of the Illinois Department of Children and Family Services.