Quoting Reagan's Mom ♥:" <blockquote><b>Quoting Red Bottom:</b>" <blockquote><b>Quoting ♥ ... [snip!] ... their time. They don't have to write a report for something not criminal."</blockquote> Actually thats not correct."
IF he did call the police it would be for a reason. He could say whatever he wants to the police to get them to side with him. Because the children are in HIS house he has custody of them. He could use the power of the police to get her to leave the children there. (I'm positive there is a law where we live that states if there is no court ordered child custody arrangement in place that whoever has the children is in custody.)
He could just be trying to scare her.
Either way she needs to go get an arrangement figured out so he can't say "Hey, leave the kids here or I'm calling the cops." It isn't healthy to confuse the children or fight about when to give them back.