Justin and Mrs. Grimes are Charlie's family members who are mentioned in his file case.
Mrs. Grimes[]
She is the wife and mother of the Grimes family, not much is known about her. But it is implied she has a good relationship with her husband and kid.
Justin Grimes[]
The only child of Charlie Grimes and Mrs. Grimes, not much is known about him either. It is stated that he does love his father very much as they have a very good relationship with each other.