Ask Marilyn: Twin Sisters Marrying Twin Brothers

Francis Gibbons of Yorktown, Virginia, writes:

Marilyn: A while ago, I read a wedding announcement about identical twin sisters marrying identical twin brothers. If both couples have children, their offspring would be called cousins. However, wouldn't they really be more akin to brothers or sisters?

Marilyn responds:

Yes, they would, but bear in mind that brothers and sisters are almost always very different from each other, regardless.