Christmas all my 10 year old wanted was his own switch lite and I figured why not, it would cut down on the fighting over time on the switch.

Fast forward and now my boys both fight over the lite and never touch the old switch. I asked my son why they can't each use a switch and my 12 year old said something about the games were all "transferred" to the new switch?

I'm wondering because I'm thinking of buying my boy luigis mansion for his birthday this month and I heard it's cooperative and I'm wondering if I'd need to buy 2 copies for the boys to play against each other.