swedane, I know about that post (and thanks for giving the link here :); yesterday I was too tired to do that), but I sometimes seeing a particular collectible on the ground (like dragonfly) gives a better idea what to look for.

Simsane, two clovers didn't show up at the same time; I just dropped two kids on the same clover. It is possible to do so; pause, drag two kids, unpause while dropping one on collectible, then quickly drop the other kid. At the beginning it helped a lot for the family economy, but it's also cute, esp when twins are carrying the same collectible.