He's an heir
Louis is the only son of the 9th Earl Spencer, and even though he has three older sisters he's the de facto heir to the Althorpe estate and will eventually inherit the title of Earl and the estate from his father.
His sister is Lady Kitty Spencer
Louis is the son of Earl Spencer, Princess Diana's brother, who is divorced from Louis' mom Victoria Aitken. His sisters are Kitty and twins Eliza and Amelia. He is the youngest.
He has an Instagram account
Royals and their Instagram accounts have been somewhat of a hot topic for the last several years. Meghan Markle, now formally the Duchess of Sussex, was forced to shut down her social media pages following the announcement of her wedding to Prince Harry. Princess Eugenie has her own personal social account which she posts to regularly, as well as a throw of younger royals who regularly share the details of their lavish lives to Instagram. Louis is among them.