I did the same with my good lady a few weeks ago. The shver n shvig came to our place for the weekend whilst we went to a nice hotel.
The shver n shvig got nachas from the Kids, the kids got to know their Bubba and zaida, and we got a weekend of bliss.
A WIN-Win situation.
The kids were warned well in advance that Daddy & Mammy are going away, and Bubba & Zaida are coming to stay. After shabbos when Daddy & MAmmy come back, Biubba & Zaida are going home. They were so well prepared, they were even excited for the little adventure!