Albireo, again, because it never gets old
Neighbours came over with their kids. Albireo is the safe bet: split at any magnification, colours obvious even to someone who has never looked through a telescope.
After that we tried the Double Double in Lyra. At 120x both pairs split cleanly, at 60x the kids saw "two stars that are a bit fat".
Note to self
Bring the red torch with the dimmer, the cheap one is far too bright.