Authorities are still trying to piece together what drove an Oakland County mother to take her two young children to Bangor Township in Bay County, where they were found shot to death in her car Tuesday in a possible murder-suicide.But according to records on file with Oakland County Circuit Court and Farmington Hills' 47th District Court, Nikita Landrum had been dealing with custody issues for more than a year, was the victim of domestic violence at the hands of the children's father, Dariel Walker, Jr.