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Out of curiosity where do they wash their hands?
I think if you're not going have them washing hands in the kitchen sink or if the boiling water tap can be located next to the hobs, then you reduce the risk.
Personality/temperament of your kid is a big factor too. #2 might not play with it when they're at tap reaching age, but #1 would 100% have a crack at washing their hands with boiling water to see what happens. My understanding is mini-Tenderloin's appreciation of risk and rules is still TBC.
this is the sort of practical advice I need.