WEST BROOKFIELD — A day after the bodies of a mother and three children were found in their Old Warren Road home here, Worcester County District Attorney Joseph D. Early Jr. urged people to “be careful, be vigilant” and report anything they saw on the road in the last few days to police.“No matter how small or insignificant you think your information may be, if you saw someone, if you saw a vehicle on that road, we’d like to talk to you,” Early said, adding that the time frame authorities are interested in is Wednesday to yesterday.