brothers-in-law和brother-in-laws这两复合词的复数哪个对?

brothers-in-law和brother-in-laws这两复合词的复数哪个对? brother-in-law 复数 请问2 brother-in-law 还是2 brother-in-laws uncle in law与brother in law 的区别 “brother-in-law"是什么意思? his brother-in-law和niece是什么意思 son-in-law 的复数是不是sons-in-law Tom has three__ .1.brother—in—law 2.brothers—in—law 3.brothe brother-in-law和brother有什么区别. father- in -law,mother-in-law,brother-in-law,sister-in-law怎么 有没有谁能告诉我mother-in-law,brother-in-law的意思啊? sister and brother-in-law a happy