Hi there @KennethKok83,
EMO can listen and react to any human voice or any sound.
But the problem you are having with the voice of your kids is already known and usually resolved with the new firmware update, but due to a technical issue, it is currently suspended and may only be released later this month.
[Firmware Update] 2.1.0 EMO Plays Snake (Temporarily suspended)
Go to the link below for more guides that might help to resolve the issue.
EMO Wake-up Training Page OPEN
EMO Wake-up Training Page OPEN - Submit your voice now!
Best Regards and Goodluck