When describing family members by marriage, the term "in-laws" is commonly used. However, there are many different synonyms for this phrase. Some may say "relatives by marriage" or "extended family". Others may use more gender-specific language, such as "brother/sister-in-law" or "father/mother-in-law". There are also more colloquial terms like "the in-laws" or "the outlaws" (if you have a more difficult relationship with them). In certain cultures, there are specific terms for in-laws, such as the Hindi "saas" for mother-in-law or the Mandarin "jia zhang" for parents-in-law. Regardless of how you refer to your family members by marriage, the most important thing is that the relationships are built on respect and love.