We like your kids, we really do. But no. (exceptions can be made, call us).
Beaver Meadows allows nice pets, but be sure that is allowed in whatever condo/room/campsite you book.
Were they on the invite or the RSVP? (Exceptions can be made, call us).
https://www.beavermeadows.com/ Drive or fly into Denver or Ft. Collins (maybe even Cheyenne/Laramie I guess). You will need a car or a ride up here. The road is dirt part of the way but my friend drove me up in a Honda Civic once.