I use one similar to this for the kids, but it is a bit of a pain to set up...
https://www.youtube.com/watch?v=NuFNHPIw-aQI might get one (or two) like this next time for the kids:
https://www.youtube.com/watch?v=TRHDJ49zP34Problem with the second type of blind, is that I want to be sitting right next to the child (to communicate with and control the child). You would need to set up some system with two of them (or so I would think).
I found it to be a challenge to take my little girls this season... Creating a situation where they can see without being seen is somewhat important if you consistently want any degree of success... I tried using fallen logs or rock piles as natural blinds when possible, but they desperately want to move or get a better look at things at the exact wrong time...
It was very interesting for me to note the vast difference in perspective as to what I found interesting and exciting compared to what my children did... We have a gobbling bird headed towards us, and they lose their mind when they see a frog... I see a big pine cone on the road as something to avoid stepping on, and they see it as something to stop and investigate.
Both of my children (independently of each other) enjoy making little forts and structures out of sticks and leaves... Last year my oldest made an impressive structure (roof and all), she did so quietly and with patience & enthusiasm while I tried to work some birds that never came. She wanted to take it home in the worst way, and the only way to convince her that she could not was to let her attempt the impossible task of moving it.
Both my children enjoy dove hunting and duck hunting more, due to being able to move around and see things... Sitting painfully still and quiet is difficult and to some degree unpleasant for them... I make sure to have some fun activities (between working birds and after the hunt)... Frog hunting (as I found this year to be important), looking for the "biggest" pine cones, a quad ride (which is huge for them), sitting on my lap and driving down the dirt road to a new spot, etc...
Both kids can use a box call, and my oldest can cluck, cut, and purr on hers... My biggest problem with her is getting her not to call... I had a discussion with her about "over-calling" but was hesitant to explain playing "hard-to-get" to my 7 year old daughter.
It is my impression that I must make it fun for them to some degree, while also showing them that there is some degree of patience and work required to be successful in the field (or in anything for that matter).