How do expressions like "二嫂" work in Mandarin? From what I've known from watching Chinese dramas, siblings or fellow disciples may refer to each other as:

&quot;big brother/sister&quot; (oldest/first)
&quot;2nd/3rd brother/sister&quot; (in-between)
&quot;little brother/sister&quot; (youngest/last)

But I came across a translation of Hometown (故鄉) by Lu Xun, in which there's a lady known only as 杨二嫂 (I Googled this Chinese form). I guess this means &quot;wife of a guy who is the second sibling&quot;.
Could anyone here who's read this one tell me what it really means? If that woman is called &quot;Second Older Aunt-in-Law Yang&quot;, would it make her husband &quot;Second Older Uncle Yang&quot;? (by the way, is &quot;Yang&quot; her name or her husband's name?)
Does this work the same way for women and their husbands? And does it work the same way with &quot;younger uncles/aunts&quot;?
嫂 means &quot;sister-in-law&quot;
杨二嫂  means &quot;wife of the second son of the Yang family&quot;.
It doesn't matter if you are the elder son or third son in the Yang family, she is still 二嫂 (second sister-in-law) to you. The character 二 here doesn't indicate older or younger, it indicates the second born.
Outsiders would call her 杨二嫂 to indicate they are addressing the &quot;Yang's second daughter-in-law.
&quot;second aunt-in-law Yang&quot; is 杨二嬸
&quot;second uncle-in-law Yang&quot; is 杨二叔