3 Add the apostrophes in the correct places. Then choose the correct answer, a or b. 1 My mothers new husband is my a.father-in-law b.stepfather 2 My sisters husband is my a.brother-in-law b.stepbrother 3 My sons wife is my a.son-in-law b.daughter-in-law 4 My fathers wifes daughter is my a.sister-in-law b.stepsister erb