4 kids, 2 gold accounts - only 3 can play. Help?

The host can try to play around with the invite settings. Either turning off 'invite only', or 'friends of friends' etc and see if you can get them in that way. With one gold account they can only play online with a guest account of course.

Depends on which account has the subscription

For example since ee are taking only 2 consoles

If you mean 2 kids playing with each other or only you playing with the kids on another console

Account 1 you

Account 2 kid b

Account 3 kid a

Console 1

Console 2

Account 1 can designate console 2 as home console and all accounts can use the games and gold subscription on console 2

Console 1 account 1 can use your console while signed onto five ONLY as it is the only profile that can roam

OR if your choose only the children to play on both consoles when account three has to have the subscription and replace acountn1 as the subscriber

This means account 1 can only use the subscription ob console 2 home console

This is how alk consoles work with the exception of the upcoming ultimate family plan or Nintendo's family plan currently out

Set console 1 as HOME console.....anyone can play on this console (wife and Kids) without you being signed in (gold Account)

Console 2... If you are signed in (Gold account) on this xbox your wife and kids can also play sharing your Gold features and games.

This is what I do when my two boys want to play each other on separate xbox's and the same game...

Console 1 (home Xbox) kid #1 signs in

Console 2 , I sign in (GOLD account), kid #2 signs in

they play together

We run 2 xboxes all the time, basically we have our front room xbox set as the home xbox for the account with gold. Any other child accounts and other adult silver accounts can play on this xbox with out the gold account being signed in. The backroom xbox
is setup for the gold account to log into, this xbox is not setup for any account as home. So the only account that can really use it is the one that has gold which is my account. So I can play in the backroom while the kids play in the front. So what we do
if both kids want to play on separate xboxes? I sign my gold account into the backroom and then allow one of the kids to also sign in. As long as the gold account is logged into the backroom both kids can play on either xbox. As for content it needs to be
bought and downloaded by the account that has gold for everyone to have access to it on the home xbox. Hope that kinda gives you a picture of how it works.

Let me see if I can explain it for you a little better.

No matter what console an account is signed into it will always be able to play its digital games and use any of its subscriptions (gold, game pass, EA access)

Each profile can set ONE console at a time as its home console and ANY other profile on that console can then play its digital games and use its subscriptions without the main account being signed in at the same time.

Each profile can change which console they have set as their HOME console only FIVE times a year.

So lets look at your situation. You said you have all the subscriptions and games under your account

I will use this diagram

A1- Your account- Has all the digital games and subscriptions

A2- Kid 1 account

A3- Kid 2 account

A4- Kid 3 account

No matter which of the 3 consoles you sign into you will be able to play the digital games and use your subscriptions

C1- Console 1 - You set this console as your home console ALL 3 kids would be able to play your games and use your subscriptions

C2- Console 2 - Would only be able to play your games and use your subscriptions if you are signed in at the same time

C3- Console 3 - Would only be able to play your games and use your subscriptions if you are signed in at the same time

The thing is this you would only be able to be signed into ONE console at a time so in the scenario above only 2 of your kids would be able to play any of your digital games at the same time. Now if you were to buy a Physical copy in the above scenario
Console 3 would be able to play the game on their console at the same time as the other 2 kids but they would not be able to use any of your subscriptions.

So in your scenario if the game is an ONLINE only game you would at least need 2 gold subscriptions and 1 digital copy of the game and 1 physical copy of the game.

They should never of been able to play that game at the same time online unless someone somewhere had a gold subscription.

Once you signed in on the 3rd xbox it should have signed you out of the second xbox and kicked that kid from the game and online if he was online.

Now you did say that you bought the Xboxes used It is possible that someone else still has that xbox set as their home xbox and still has an active gold subscription that is allowing your kid to use it.