Unless the flange was installed above the finished floor, it will take two rings.
And you have two five year olds and they never hit the floor? That's pretty good. How many toys have they tried to flush down the bowl? You might find a few of the there in the lower trapway.
But really, the Memoirs toilet was a dog to start with. Good luck with that. That is not the choice I would have expected you to make with two boys.