We’ve got a five year old and an almost three year old, and I thought we’d get a SIMON game for us all to play together. I was chagrined to learn that they don’t even make SIMON anymore! It’s a great game for players of all ages - you can have a little kid take a color and instruct them when they should hit their button.
I saw that there is a UNO Robot game out there, but that’s probably a little to advanced for our brood. Anyone have recommendations for a family game that everyone can play?
You can get a mini-Simonhere. 
Bop It is something in a similar vein.
Here is a freeware version of Simon for the PC:
You can still buy a Simon game… for FIVE HUNDRED FREAKING DOLLARS!
Within the last two years my kids were given a game very much like Simon - made up of four cubes. There are different games you can play with them, but one game is the same as Simon- they light up in four different colors and sounds and you have to repeat the pattern which gets longer on each turn. I’m sorry I can’t remember the name of it though. I’ll try to find it.
EDIT: Duh, here it is: you want Simon Flash.