It's hard to tell if he's changing his story, or if this is just shoddy reporting. We've got news reports saying blood was found in the home, but that never came from LE, just the father of the children, citing the neighbor. The LE said that it was "unusual circumstances" for someone to be living in - which is an odd way of phrasing things. Wouldn't LE instead say something to the effect that physical evidence indicated possible foul play? To me, LE may be implying something far different than beer cans and blood, but that's what the media's been reporting. I'll wait for LE to untangle things a bit and straighten out reporters until I suspect the boyfriend.
And it seems like the lack of information about a possible abductor is what's holding up the Amber Alert. I understand the reasoning for the qualifications, but in a case like this, precious time has already been lost.