My younger brother is still at high school我弟弟还在上中学
My younger brother is still at high school.
我的弟弟还在上中学。
A So, if your older brother has a baby girl, you're her uncle!
A 那么，如果你的哥哥有个小女孩的话，你就是她的叔叔了！
B Yes, I'm her uncle.
B 是的，我是她的叔叔。
A And your younger brother? What about him?
A 你的弟弟呢？他怎么样？
B Oh, he’s much younger than me. My younger brother is still at high school.
B 噢，他比我小得多。我的弟弟还在上中学。
A So he still lives at home with your Mum and Dad.
A 这么说他仍然和你的父母住在家里。
B Yes, he's still at home. I guess he'll go to college next year.
B 是的，他还住在家里。我想他明年上大学。
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Notes：
1 There are many words to describe specific relatives, e.g. uncle / uncle; aunt / aunt; nephew / nephew; niece / niece; cousin / cousin.
有很多词语可以描述具体的关系，例如uncle / 叔叔、伯父、舅舅、姨夫、姑父；aunt / 婶婶、伯母、舅母、姑母； nephew / 外甥、侄子； niece / 外甥女、侄女； cousin /表兄弟姐妹、堂兄弟姐妹
2 Remember the word still / still to describe something which someone is continuing to do, e.g. He still lives at home / He still lives at home; He’s still at high school / He's still at high school.
记住still /仍然是用来描述某人继续做的某事。例如：He still lives at home / 他仍然住在家里； He’s still at high school /他还在上中学。
信息来源：北京市民讲外语活动组委会