There is no direct, credible evidence from authoritative sources confirming that an IDF soldier admitted on local Israeli radio Kan Bet to killing two children and a mother.
IDF soldier admits to killing two children and mother on local Israeli radio Kan Bet

IDF opens inquiry into possible war crimes after deaths near Gaza aid sites - Gaza | The Guardian
Source: theguardian.com
Key Evidence
Investigations by Haaretz and reports from Arab News highlight allegations of soldiers admitting to targeting Palestinians but do not confirm admissions on Kan Bet radio.
The Guardian and BBC report inquiries into possible war crimes but do not mention such a specific admission.
The IDF officially denies deliberate targeting of civilians.
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What the Evidence Shows
The claim that an IDF soldier admitted on local Israeli radio Kan Bet to killing two children and a mother cannot be substantiated based on the available credible sources as of August 1, 2025. While multiple reports document allegations and investigations related to IDF actions in Gaza, including accusations of targeting civilians and possible war crimes, none specifically confirm a soldier's admission on Kan Bet radio regarding such killings.
Some sources discuss videos or social media content allegedly showing soldiers admitting to targeting Palestinians, but these do not specify the exact admission described. Official IDF statements generally deny deliberate targeting of civilians. Without direct evidence or official confirmation, this claim remains unverifiable.