Hur hanterar man barnhistoriker?

If you mean he talks a lot... well, that's just what 3-year-olds do. And hey, as annoying as it can be it is a good thing. Just answer him and he'll get LOTS of practice in how to talk and respond to other people.

When I sometimes felt like it was way too much, I simply took over for a bit - shared some information of my own, asked something, pointed at something interesting to divert his attention, asked if we should sing a song, listened to some music... it's not quiet, but I found it provided a nice change of pace.