My god-damn brother is giving my pin out to all his friends.

[klewless]

If my key gets changed, will all of my brother's friends be logged out of blockland?

[Ad Bot]

[zenloth]

If your key gets changed, anyone attempting to use it will no longer be able to use it as it will have been de-activated and a new key distributed to you.

[Regulith]

If my key gets changed, will all of my brother's friends be logged out of blockland?

They'll probably complain to your brother, lol.

[Kalphiter]

Kill you brother

[deathrider]

Kill you brother

yer id do that lol

[(Hit Man)]

Tell them you'll smash there Computers, Xboxs whatever they need to be smashed if you don't stop.

[Skulltulla]

Is it a younger brother? i.e. Is he smaller than you?

[KoopaScooper]

If my key gets changed, will all of my brother's friends be logged out of blockland?

Yes, they will.
Once your key changes, the letters and numbers that your old key was won't be active anymore. Instead, the new one will be active, instead of your old one.
Your stuffcake brother will be bitched at by his friends.

[Sarataz]

You really should forget your brother up for doing something stupid like that...

[Frankies131]

Get some rat poison and put it in your brothers soup...

Rat poision is bad to rats not us it wont do anything but make you alittle sick thats all

[The Russian]

If my key gets changed, will all of my brother's friends be logged out of blockland?

You can't really "change" a key, but you can have it deactivated (meaning disabled) and get another free key.

[Kevdude]

Rat poision is bad to rats not us it wont do anything but make you alittle sick thats all

You are kidding right?