I'm going to speculate for a moment. Based strictly on what we do know and my research of how CPS and LE operate. JMO MOO! CPS probably placed the boys with a family member well known to them. There could be an order of protection that mom and bf can't go near them for the time being. Bio Dad will have to prove himself worthy to obtain custody. Based on the interview he gave last night, he is busy gathering info, etc from the past year or so.
BF, at the very least, would be laying low and under surveillance, I think.
Mom... hmm... what would I do, if I were her? Since she is absent in MSN, maybe she is laying low as well or flipped out from shear panic (especially if she knows something) and has checked into a hospital. (Seems I remember the girlfriend of Destiny (can't remember her last name), pulling the mental breakdown thing and ending up hospitalized.)
Anyway, all just my own speculation and thoughts.
Oh, and the CPS folks who returned the kids to mom... they are busy try to CYA... JMO MOOOOOOO.