It happened Friday in Easton.
Easton Police pulled over 30-year-old Bethany Donst of Belvidere in northern New Jersey and determined she had been driving under the influence.
Police say when she called her sister to pick up her car, officers found Erin Donst had been drinking, too.
According to WFMZ-TV, Easton Police booked both siblings at the Northampton County DUI Processing Center, and both will receive summons for DUI.
