i have some questions
1. where are brad family did they leave the town after the first film, or is the town brad is visiting a neighbouring town
2. why had it taken 2 years for the critter eggs to hatch
My shot at answering:
1) I'm presuming Brad's family left town after the events of the first film. Megan's (sp?) dad says about how Brad's stories about the critters almost ruined the town so I'm guessing they got a bad reputation after trying to tell what happened and so left, also probably wanted to get away from such a traumatic place.
2) The only information we're given regarding this is the heat - it's only when they are put right by Quigley's heater that we see them start to show any signs of life.