welcome to fishlore mamafish!!!
congrats on cycling fishless
unfortunately, I do not think even 4 danios would be ok in that size tank

they like to have more swim space and with the smaller tanks, its hard enough to keep the water parimeters on track as it is..overstocking with the danios, might be too much for you...how about 4-5 neon or cardinal tetras? or a
betta? or some sparkling gouramis? even a cool shrimp colony would be fun for kids..although they do hide allot ...im sure some other members will have more suggestions and I hope you and the kids have fun!