...and they all live in one house
Phil and Doug Malm are identical twin brothers which is seen as pretty normal until you meet their wives, Jena and Jill - who are also identical twin sisters.
The confusing part about the Malm family is that they all live under one roof in Moscow, Idaho, and have one child each - who look like each other.
The 58-yr-old twin brothers married 48-yr-old twin sisters at the Twins Festival in Twinsburg, Ohio, in 1993, Daily Mail reports. The festival is said to be the largest twin gatherings in the world, attracting up to 3,000 sets of siblings each year.
The Malms who have lived together all their lives met each other in 1991, got engaged in 1992 and married the following year.
"People don't understand why we want to live together. It's just that twin bonding thing that we have no problem with," Phil explained to Deseret News in 1993.
"People always ask us if we're independent, and I tell them that we're very independent," Doug added.
Phil and Jena have a son, Tim, and Doug and Jill have a daughter, Rylie.