以下都是正确的表达
1 Some children want to challenge themselves by learning a language different from the one that / which their parents speak at home
2 Some children want to challenge themselves by learning a language different from the language that / which their parents speak at home
3 Some children want to challenge themselves by learning a language different from what their parents speak at home
------ 你注意比较一下,然后你就明白了.