It's been reported that these two numbnuts coordinated their outfits to show support for Ukraine:
You were right
Jill Biden and granddaughter wear Ukrainian colors in solidarity at coronation
First Lady Jill Biden attended the King's coronation Saturday alongside her granddaughter in Ukrainian colors.
Finnegan Biden, 23, was the first lady's plus one in Westminster Abbey as President Joe Biden was not in attendance. The Biden's second-oldest granddaughter wore a yellow Markarian dress complete with a cape while Jill Biden wore a blue top and skirt by Ralph Lauren, in apparent solidarity with Ukraine.
"We stand with Ukraine," Biden tweeted the day before the coronation.
https://www.washingtonexaminer.com/news/jill-biden-granddaughter-ukrainian-colors-coronation