My son falsley accused me and his father of child abuse?

My 13 year old had been removed from my home after a call to CPS by an unknown person accused us of beating him. My son went along with the story and told the investigating officers and all the people involved a bunch of lies. The CPS worker said she saw scab on his leg a slight bruises on his neck. I have a total of 6 children and they have made an appointment to come to my home thursday and see the other children what should i do. At this point I do not want the 13 returned home because of the h allegations and lies he told about me and his father but do not want them to take my other children who love me and want to be home with me. How can i allow cps to keep him, clear my and my husbands name and keep our remaining children?