[誤] Kevin is the most warm-hearted of his brothers.
[正] Kevin is the most warm-hearted of all the sons in the family. /Kevin is more warm-hearted than any of his brothers.
注:“his brothers”并不包括凱文本人,所以用最高級不正確。
參考例句:What about his brothers, is that a problem? 那他的兄弟幾個呢?會成問題嗎?