Many Parents . . .

[Buenchico]

. . . tell their kids to "Play nicely together" but not many can do it as well as this! 

[Peter Pedant]

quite remarkable

[Buenchico]

Thanks, Peter.

I like the way that the two brothers (who're 12 and 10 years old, btw) smile at each other at the start, as if to say "OK, brother, let's really have some fun with this!"