After reading the IDF explanation as well as the PCHR preliminary investigation into the deaths of the mother and four daughters this morning, I am convinced that the IDF version is correct - the IDF shot a missile at two terrorists who were outside the Abu Meatak home, and the explosives that at least one was carrying exploded, killing most of the family.
I would not count these as self-deaths, though, because it was a secondary explosion; it is not a "work accident" although their carrying explosives through a neighborhood and putting families at risk is clearly a war crime. (It's a judgment call but I need to be consistent in the count.)