Deployment family story

Here's conversation between P and SY this morning.

SY started with "If you get hurt, I get mad, so don't get hurt. Because I always tell you to be careful."

Then P said "you're supposed to be nice" and SY smiled. She asked, "Why?"

He didn't really give a specific reason why, though he tried, saying "because [blah blah blah]..."

But she thought that was cute for him to be able to say "supposed to be."