How about DBIL's Parents?? Could they go over, or have the kids brought back to the US, I'm sure they would be scared, not knowing what's going on with their Mom, but between you, Jen and DBIL's parents the kids would be loved and cared for, till Mom & Dad can take over again.
I just can't even imagine what you must be going through. That would be scary enough ere, let alone adding in the language barrier of a foreign country.