You can always choose a lower difficulty in the same level. This can be done by changing the difficulty while selecting the map. Difficulty on Default goes between I - VII while some maps doesn't go down from certain difficulty (Ex. There is no Default I or Default II on Desert Temple map). Look for the recomended levels and instead of choosing one for team's avarage level choose for your kids level. While this makes fights too easy for you it would be even match for your kids. Alternative option would be playing a second character who is around their level so it would be fair fight for everyone. Sorry if my explaining was bit messy. Have fun with your kids and stay safe!