英语哥哥和妹妹怎么说

In English, a brother is referred to as "brother" and a sister is referred to as "sister." If you are referring to a specific brother or sister, you can use the possessive form, such as "my brother" or "my sister." If you are speaking about siblings in general, you can use the plural form, "brothers" and "sisters."
For example:
"I have one brother and two sisters."
"My brother is older than me, but my sisters are younger."
"We are all brothers and sisters in this family."
Note that "哥哥" and "妹妹" are Chinese words and do not directly translate to English. In English, you would use the words "brother" and "sister" to refer to siblings.