Paint your ears
You say whatever makes them happy even if it's total crap. You're like a dog who just wants a treat and doesn't care if it's a piece of old pizza.
'You're my favorite brother!' (while thinking 'you're the most annoying brother ever')
'That speech was amazing!' (while thinking 'you rambled for ten minutes and I was dying')
'You're the best at that game!' (while thinking 'you lost three times in a row')