他那个25岁的哥哥是位英语老师。（他不止一个哥哥，其中25岁的是英语老师）
A: His brother who is 25 years old is an English teacher.
B: His brother, who is 25 years old, is an English teacher.
A: His brother who is 25 years old is an English teacher.
B: His brother, who is 25 years old, is an English teacher.
