+1 for the Horizon and Parkzone stuff for beginners.
As stated, the tricycle gear of the T28 is probably better than a tail dragger, OR you can go with a foam trainer with no gear at all - another good option, as landing in grass with no gear is simpler than any gear at all at first IMO.
Also, a good option for your kids - get a simulator, Horizon sells a decent one, and you can use the DX series Spektrum transmitters for both PC and for your aircraft. Learning to fly on the sim on a pc my sound suspect, but I taught myself to fly R/C helos and planes with it, and now fly large electric 6 and 700 sized helos in addition to planes, all from self teaching.
Yes, you will crash, but I've only written one helo off out of the dozen or so I have, they are very forgiving now, especially with the AS3X stuff. Foam planes are even more forgiving, so long as you don't have a power on nose down crash, you likely will be able to easily fix most damage (I have).