Red, White & Royal Blue

Alex, the son of US President Ellen Claremont-Diaz, is like an American prince. Together with his sister June and the Vice President's granddaughter Nora, they form the White House Trio, the closest equivalent to the royal family.
When Ellen launches her re-election campaign, she knows she could not ask for better campaign assistants. However, everything changes when a photo of a possible fight between Alex and British Prince Henry, Alex's long-time rival, at a royal wedding, hits the tabloids. To prevent an international scandal, the family decides to pretend that Alex and Henry are actually best friends.
The staged friendship starts out as an innocent game, but over time it evolves into something much more and riskier.