Its hard to do QDJ without feeling its a repeat of the first movie in some way. The best I got so far is M'Baku chased her parents out of the Jabari lands and Tchalla relocated them to America before she was born. Then the parents die in a car accident or something and Tchalla sends War Dogs posing as her grandparents? To help with the age issues, it could have happened during the 10 years he was BP without being King.