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.