哥哥我一向很霸气姐姐我一向没素质
[gē gē wŏ yī xiàng hĕn bà qì jiĕ jiĕ wŏ yī xiàng méi sù zhì]
It says 'I, the older brother, am always dominant; I, the elder sister, am always rude.' Used humorously, this portrays opposite character stereotypes for males and females.