Travis_Bickle 'Legally speaking' it's important to define what genocide is if you're accusing a state of committing it.
Thousands of British children died in the Blitz. Far greater numbers died in the Allied bombings of mainland Europe and beyond. Those are sickening numbers, just as the ones in Gaza are. But that doesn't mean it's a genocide.
The "Legally speaking" definition:

The "But it doesn't mean it's genocide" part... Here's what the Report of the Secretary-General: Israeli settlements in the Occupied Palestinian Territory, including East Jerusalem, and the Occupied Syrian Golan (A/80/399) says. Full report available here.
- The policies and practices of the Israeli administration further consolidated
and extended the annexation of large parts of the Occupied Palestinian Territory,
while emptying large parts of this territory of Palestinian communities. The
character, status and demographic composition of the occupied territory
continued to be altered through the actions of the Government of Israel, which
included the ongoing forcible transfer of Palestinians and the transfer of part of
its own civilian population into the Occupied Palestinian Territory, together with
structural changes of governance. These population transfers may amount to
war crimes and, under specific circumstances, also to a crime against
humanity.