Why did princesses beatrice and eugineie get the title of princess?

Princess Beatrice and Princess Eugenie, daughters of Prince Andrew, Duke of York, received the title of princess due to their royal lineage as granddaughters of Queen Elizabeth II. The title is traditionally bestowed upon children and grandchildren of the reigning monarch, which in their case, aligns with British royal protocols. Despite their royal titles, they have chosen to lead more private lives and often hold professional careers outside of royal duties.