Ha! I just taught this to my class on Friday. When I told them the s goes after brother not law they thought I was lying and the book was wrong. Then I really confused them when I showed the plural possessive form brothersinlaw's!
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In one of our grammar units at the high school I taught at there was a section that taught the students that the plural form of manservant is menservants. Because apparently the curriculum developers thought we'd be teaching grammar to Lady Gaga.
Re: Hey, grammar police. Come in...
I stopped being lazy and pulled out the laptop to Google it.
Brothers in law, for those wondering.
Brothers. You have more than one brother not more than one law.
Though people get that wrong ALL the time.
Ha! That's the problem, it just