Hezbollah employs doctors (heck, it runs hospitals) and Hezbollah personnel (in any of the political, armed, or social services parts of the organization) presumably fairly often live in households with children.

"Doctors and children are among the dead" isn't inconsistent with "this came from an order of devices specifically for Hezbollah" (it does cast doubt on "this was a precisely-targeted attack on Hezbollah combatants", but that's a very different claim.)