请问2 brother-in-law 还是2 brother-in-laws

请问2 brother-in-law 还是2 brother-in-laws “brother-in-law是什么意思? father- in -law,mother-in-law,brother-in-law,sister-in-law怎么变名词复数? brother-in-law 复数brother-in-law 的复数是brothers-in-law uncle in law与brother in law 的区别 sister and brother-in-law a happy his brother-in-law和niece是什么意思 请问sister in low mother in low?brother in low?能全面的说明就好.还有daughter in law?son in law? Kate has two sisters,so she will have two ____.A.brother-ins-law B.brother-in-law C .brother-in-laA.brother-ins-law B.brother-in-law C .brother-in-laws D.brothers-in-law brother-in-law和brother有什么区别. Congratulate my sister-in-law and bless my brother sister-in-law什么意思 step-son ,step-mother ,step-brother ,sister-in-law ,parent-in-law变为复数 The doctor checked up Mike's ________ hearts.A.mother in law's and his brother in law's　　B.mother's in law and his brother's in law　　C.mother in law and his brother in law'sD.mother in law and brother in law's为什么选A 嫂子用brother's wife还是sister-in-law? 嫂嫂怎么说?是“sister in law”,还是“brother's wife? my brother in law is talking with my Tom has three__ .1.brother—in—law 2.brothers—in—law 3.brothers—in—laws 4.brother—in—law′ the doctor checked up both wang's hrartsAfather-in -law's and his brother-in-law's Bfather's-in-law and his brother's-in-lawcfather-in-law and his brothrt-in-law'sD father-in-law's and his brother-in-laws'