The in-law part refers to by marriage and legality so yes your sisters husband is considered your husbands brother in law. Just as much as your sister is considered your husbands sister in law, by marriage to you...
http://wiki.answers.com/Q/Is_my_sister's_husband_consid...
Relationships question: Is my wifes sisters husband my brother in law? yes. ... What is wifes sisters husband relationship to her? Is your wifes sisters husband your brother-in-law? Is my husband's sisters husband my brother in law? Is your husbands sisters husband your brother in law? Would your wifes brother s wife be...
wiki.answers.com/Q/Is_my_wifes_sisters_husband_my_broth... wiki.answers.com/Q/Is_my_wifes_sisters_husband_my_brother_in_law
Husband/wife of brother/sister-in-law English Only ... The thing is, brother-in-law can mean two things: (1) my wife's {or husband's} brother ; (2) my sister's husband; Similarly, sister-in-law can mean; (1) my wife's {or husband's} sister ; (2) my brother's wife. So the answer is "in the context of meaning (2)";
forum.wordreference.com/showthread.php?t=926968
and sister's husband. While the list mentions one brother-in-law-the sister's husband-it fails to invoke the possibility of the other brother-in-law-the wife's brother-counting as a relative. The definition gains significance in the light of defining a company director's interest.
www.expressindia.com/fe/daily/19970825/23755443.html
(KudoZ) Spanish to English translation of Mi concuño y su esposa: sister-in-law's husband/brother-in-law's wife. ... my husband's brother-in-law/my wife's brother-in-law/my sister-in-law's husband...
www.proz.com/kudoz/504536
Life & style ... I refer to both my sister's husband and my wife's brother as brothers-in-law. Is this the same in other languages?; Name: Home town: Country: Email: Your answer:
www.guardian.co.uk/notesandqueries/ask/0,5753,-5365,00.... www.guardian.co.uk/notesandqueries/ask/0,5753,-5365,00.html
The husband of my daughter is my son-in-law; the wife of my son is my daughter-in-law. If my spouse has children from a previous marriage, those are my stepchildren, not sons-in-law or daughters-in-law. I am their stepfather or stepmother, not their father-in-law or mother-in-law. ... Brother-in-Law, Sister-in-Law...
oakroadsystems.com/genl/relation.htm
Obama, who was in the midst of his campaign for a Senate seat, was following his brother-in-law for the 70 kilometres on the QEW. Ng didn't want to lose the future leader ... "For my wife and I and our child — our daughter calls him Uncle Rocky — he's my wife's older brother, my wife's his sister. We just talk family.
www.cbc.ca/canada/story/2008/06/18/f-ng.html
brother-in-law whose wives are sisters ... elder sister, elder brother's wife, elder brother, elder member of family, elder of a Buddhist monastery, elder aunt ... elder sister and younger brother, elder sister's husband...
afflatus.ucd.ie/Analogical%20Thesaurus/SameClan_type.ht... afflatus.ucd.ie/Analogical%20Thesaurus/SameClan_type.html
Can anyone other than my wife's brother or my sister's husband be my brother-in-law? It has recently been claimed by an acquaintance that the second marriage also forms "in-laws"; for instance, that my wife's sister's husband is my brother-in-law.
www.time.com/time/magazine/article/0,9171,740371-3,00.h... www.time.com/time/magazine/article/0,9171,740371-3,00.html