Together with her brother Peter , she was five times in a row US champion in pair skating from 1948 to 1952 . Karol and Peter Kennedy, known as "The Kennedy Kids", competed in world championships from 1947 to 1952 . In 1947 , 1949 , 1951 and 1952 they became vice world champions and in 1950 in London world champions. This was the USA's first pair skating world title.