Those that don’t use microwaves

Pour a little water in the rice to let it steam till warm.

I add a little oil and refry in a pan. Not sure if it's for you or you want it simple for kids, but also really good to fry up some chopped onions then add the rice

I add to a frying pan with a little water and reheat with a lid on low. If it’s a large amount or im reheating other food, I’ll stick it all in a glass Tupperware or dish, add a splash of water, cover with foil and reheat in the oven/ toaster oven for 15-20 mins at 350°

on the stove in a pan