These iPad models you purchased are hardly new.
You purchased nearly 10-year old, 2011, iPad 2nd gen models.
Apple ended support for all 8-10-year old iOS devices well over 4 years, ago, in 2016.
Third party app developers abandoned and stopped supporting these 8-10-year old iOS devices nearly 3 years, ago, in 2018.
There are, virtually, NO MORE third party apps available from the iOS App Store, any longer!
None!
Especially any popular games for kids!
AND, that over 4-year old default iOS Safari Web browser is too old, not secure and not safe to use to access the Internet, any longer.
There are virtually NO MORE third party Web browsers left for 8-10 year old iPads!
Available and more popular third party Web browser choices are pretty much GONE, now.
If you must use these old iPad models, here is what is left for still updated Web browsers.
Pickins’ are slim, now!
ALook Web browser ( A fairly new Web browser primarily designed for old iOS device versions, but is still available to newer iOS/iPadOS devices, as well )
Dolphin Web browser
Maxthon Web browser
TOR private browser
TOR + VPN private browser
Turbo VPN private browser
This is pretty much it for iOS 9/10 compatible, third party Web browsers today.
Simply put, these two 2011, 2nd gen iPads are too old and obsolete now.
Sorry, but this is the reality for ALL 8-10-year old AND OLDER iOS devices now. Especially going into 2021!
There is one last thing you can try/attempt, if you need an older version of an app, such as Netflix.
If you own much newer iOS device that can run iOS/iPadOS 13 and later, you can install the most recent app/s onto that more recent iOS device.
Then go back to your older iPad, open the iOS App Store, go to the Purchases section of the store app, search for the app/s you wish to try and download to that older iPad and see if an older version of the app is allowed to be downloaded/installed to that older iPad.
These newer iOS/iPadOS devices must use your same Apple ID user account and password.
Failing that OR IF NO joy, then there is nothing more to be done.
The thing to do is return these 10-year old iPads and get your money back and get something much newer.
iPads from 2014 to 2018 can run the latest iPadOS and current apps.
Such as
2014 iPad Air 2
2015 iPad Mini 4
2017 iPad 5th gen
2018 IPad 6th gen
2019 iPad 7th gen
2015-2017 12.9 inch screen iPad Pro models.
2016 9.7 inch screen iPad Pro.
Sorry & Best of Luck to You!