Thanks for the chapters.
Now is as good as any time to say it, but I'm a bit disappointed that the only reason for the isekai part seems to be to make 5 year olds more mature so we can have their POV.
If that's all, they could have done without the pointless reincarnation... It's like in I'm a Child of This House, where I'm pretty sure most people forgot she was even reincarnated in the first place...
There could have been an explanation for their maturity, for example they're members of the royal family so they mature faster, maybe not their bodies but at least their minds...