people who are related to you because of marriage► mother-in-law/son-in-law etc someone who is related to you because of a marriage, for example, your mother-in-law is the mother of your wife or husband, and your sister-in-law is the sister of your wife or husband, or the wife of your brother: · Surprisingly, my mother-in-law and I get along very well.· My sister and brother-in-law are coming to visit next week.
► stepmother/stepson/stepsister etc someone who becomes your mother, sister, son etc when you or a person you are related to marries for a second time: · After my mother got remarried, it took a while to get used to having a stepfather.· She has two sisters and a stepbrother.
► half-brother/half-sister someone who is the child of one of your parents but not both of them: · Alyssa has a half-brother she's never met because her parents don't speak to each other any more.
► by marriage if you are related to someone by marriage , they are married to someone in your family or you are married to someone in their family: · John's my cousin by marriage.
► in-laws informal the parents of your husband or wife: · We lived with my in-laws until we had enough money to buy a house of our own.