(3) A parent, current spouse, or cohabitant, of the parent or person seeking custody, or a person with whom the parent or person seeking custody has a dating or engagement relationship.
As a prerequisite to considering allegations of abuse, the court may require substantial independent corroboration, including, but not limited to, written reports by law enforcement agencies, child protective services or other social welfare agencies, courts, medical facilities, or other public agencies or private nonprofit organizations providing services to victims of sexual assault or domestic violence. As used in this subdivision, "abuse against a child" means "child abuse" as defined in Section 11165.6 of the Penal Code and abuse against any of the other persons described in paragraph (2) or (3) means "abuse" as defined in Section 6203 of this code.