Can a brother and sister-in-law get married?

Kevin and Deborah Jefferies have been in love for at least 10 years and wish to get married, but under the Federal Marriage Act 1961 - which prevents brothers and sisters from marrying - their relationship is taboo.

What do I call my brother-in-laws wife?

Your brother in laws wife is your sister in law.

Who is considered brother-in-law?

noun, plural broth·ers-in-law. the brother of ones spouse. the husband of ones sister or brother.

Can two sisters marry two brothers?

Double Cousins A double cousinship occurs only when a set of siblings marries another set of siblings and both have children. This could be two sisters marrying two brothers. In your case, this is a brother and sister marrying a sister and brother. Double cousins actually share the same gene pool as siblings.