Jack Brooksbank's father has reportedly been hospitalised after contracting the coronavirus.
According to People, 71-year-old George Brooksbank and his wife, Nicola, have both tested positive for Covid-19. While Nicola has been self-isolating at home, after being ill for a couple of weeks George needed urgent hospital care.
His condition is "serious but stable", reports HELLO! Magazine.
Princess Eugenie has not yet commented on her father-in-law's condition but has been sharing resources and information about the novel virus on social media.
Eugenie, along with her sister, Beatrice and mom, Sarah, has also made donations to support front-line workers.
The princess, along with the rest of her family, is thought to be self-isolating at the Royal Lodge in Windsor.