More Fun With Words

I found this little gem on our Employee Assistance website yesterday:

Peter and Ellen, on the other hand, find family gatherings a source of holiday woes. First, they drive two hours to Peter's parents' home in the country for brunch. Then, they get in the car and drive another two hours to Ellen's mother's home in the city for the holiday dinner. Peter and Ellen are not only tense from the driving and rushing around, but also because neither one of them really feels comfortable with each other's in-laws.

Wouldn't "each other's in-laws" actually refer to their OWN parents???