楼上 用younger 或者 older 来表达哥哥 或者 弟弟 妹妹 或者姐姐 是对的。
外国人的确不强调这一点 除非你看文学文章会多少强调一下这个
再告诉你一个 表哥 older brother in law .表弟 younger brother in law.表姐 表妹也一样。
中国计划生育 估计你要表达的都是上面我说的着两个 没有亲哥哥弟弟

You can share the room with m//www.souquanme.come tonight.
Can you share my happiness with me?

我和我姐一起分享它。
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share+ 抽象或者具体名词 （with sb ) “与。。。。分享”
share in + 抽象名词 （with sb ) “与。。。。分享”
Will you share my umbrella?
你愿意和我共用这把伞吗?
They shared the cake between them.
他们分吃了那块蛋糕。He shared in our enthusiasm for rowing.
他和我们一样都喜欢划船。吃了那块蛋糕。
She had to share a bedroom with her sister.
她不得不与姐姐睡一间房。
还可以作名词用
(分享到的或贡献出的)一份
I gave him a minor share of my wealth.
我把小部分财产给了他。
(参与、得到等的)份
I've had more than my fair share of troubles in my time.
我在任期内遇到了不少麻烦。
股, 股份, 股票
I deem it advisable to purchase the shares in the railway now.
我认为现在购买铁路股票是明智的。

share的用法
名词 n. 份
the part belonging to a person
I'll bear my share of the expenses.
我愿意承担我那一份费用。
Here is your share of the cake.
这是你的一份蛋糕。
Everyone can do his share for the revolution.
每个人都能为革命贡献一份力量。
I did my share of the work.
我干完了分给我的工作。
动词 v. 合用
to use with others
I share a bedroom with my sister.
我和我姐姐合住一间卧室。
You don't have to buy a newspaper; you can share mine.
你不必买报纸，可以和我合看。
动词 v. 分配；分份儿
divide something and give parts to different people
Share this bag of sweets with your friends.
这袋糖块你和你的朋友分着吃吧。
Try to get some more,we'll share them.
再弄一些//www.souquanme.com，咱俩分享吧。
We must share the joys and hardships of the masses.
我们必须和群众同甘共苦。
share in的用法
分享，分担
have a share or part in
He is willing to share in the work.
他愿意分担这工作。
He shared in the expenses with me.
他与我共同分担开支。
Let's share in our troubles as well as in our joys.
让我们同甘共www.souquanme.com苦吧。
Two families share in the use of the kitchen.
两家合用这间厨房。