An seven-year-old millionaire YouTuber may be facing an investigation by the Federal Trade Commission amid accusations that he pushed unwitting children into buying toys made by his sponsors. Ryan Kaji is the star of Ryan ToysReview channel, which has 21 million subscribers, and sees him unbox and play with toys which he then reviews. The child is worth $22million and was last year named YouTube's highest earner by Forbes magazine. The account is run by his parents, Shion Guan and his 35-year-old wife Kieu-Loan, who calls herself Loann. Together, they have found themselves at the center of a row after...