Police say the mother, Jackie Morris, 32, may be driving a Red 2004 Jetta with Connecticut license plate 876-YGJ.
Ryan Lewis, 9, and 7-year-old twins Brandon Lewis and Dylan Lewis were last seen in Vernon at about noon yesterday, May 12, according to the Amber Alert.
Police said there is no reason to believe the children are in physical danger.
Morris is 5-feet, 2-inches, weighs 120 pounds and has a tattoo of a crucifix on her neck. She has brown hair and blue eyes.Morris has ties to Connecticut, Massachusetts and Maine, NBC CT is reporting.