Older Brother, Big Brother, Elder Brother
Who's someone who's just a mouth with legs? That's your know-it-all older brother, who won't shut up about anything.
To help this mnemonic along, literally imagine your older brother as someone that's just a giant mouth with a pair of legs walking around. It talks and talks and talks, too, irritating you. Feel the irritation specifically at your older brother. He's older than you, so you can't beat him up... yet.
きょう, けい
あに, にい
None
You wish you could box your loud-mouth older brother up and send him far away to きょうと. きょうと is super far away from where you currently live, so just ship your older bro off so he can never bother you again.
Hmm... don't you want to go to きょうと someday? Maybe you should have sent your brother somewhere less cool.