http://www.livingstonmontana.com/ My mom's house is between Livingston and Gardiner, so Livingston is about 30 minutes drive from my mom's house, and about 60 minutes from Yellowstone National Park.

http://www.nps.gov/yell/planvisit/services/index.htm Yellowstone National Park services (there's a hotel in Mammoth Hot Springs, which is about 30 minutes from where my mom's house is).

http://www.gardinerchamber.com/ Gardiner has several hotels too, and is just north of Yellowstone's boundary, about 30 minutes away from my mom's house.