Sentence:  [The person] who was going to visit her with his wife had a physical resemblance to the abuser, so some of her <WSD>inside</WSD> children had a strong reaction of fear and revulsion to him. They were afraid to look at the face of the guest in case he was the abuser. 
Meaning of the word marked with <WSD> tags:  Legally married to or related to (e.g. born in wedlock to), and/or residing with, a specified other person (parent, child, or partner);  existing between two such people.