I would suggest looking for an instructor that has a website. I would have an interview with this person first and get a feel for said person. I would make sure the studio where they will be practicing is in a safe neighborhood, or have them practice at your home, where you can watch them.
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Enrolling children in piano lessons can improve their cognitive skills, enhance their creativity, boost their confidence, and provide a lifelong appreciation for music.
There are several places that have teachers that give piano lessons to children. They are located everywhere, however, specifics cannot be given as you did not list a location.
One can find the instruction on how to play a piano online from: Wiki How, True Piano Lessons, Zebra Keys, Take Lessons, Piano Nanny, Amazon, How to Play Piano, Piano Lessons, Button Bass, Virtual Piano, to name a few.
Online piano lessons are not usually offered by a qualified music teacher. Online piano lessons can be found that teach basic keys. Consult Youtube for videos.
take lessons
Piano lessons can be found online with tablatures and sheet music, but you can also take lessons from someone you know personally, or in a musical store.
Get off your but and go to piano lessons and learn
Children can start piano lessons as early as 4 or 5 years old, but the ideal age can vary depending on the child's readiness and interest in learning music.
If your child attends a local school, then you could easily pay for the piano lessons that the school offers to all children. That'd be the best option, because most piano lesson would probably too advance for your children if they're beginners.
I think it is great that your kids want to play piano. Carsoncitymusiclessons.com is now accepting students for piano lessons. Djpianostudios.com is another place in Carson City that offers beginner piano lessons.
either one but that is just my opinion.