Keep it simple.

“Big brothers are the ones who are supposed to pull their punches. Little sister…”

“Percy, you're a brave guy," [Annabeth] said. "Just take the compliment. I swear…”

“Run!” Piper said.“We are running!” Jason picked up the speed.“Run better!” Leo …”

“Thalia blushed. "Hi, Lord Apollo."Zeus's girl, yes? Makes you my half sister. U…”