Eli: Either ignores it completely or tries to rub her head and give her a kiss.
Ezra: Puts his hands over his ears and tells me "Mom, Zoe's crying", "Mom, Zoe's crying", "Mom, Zoe's crying", "Mom, Zoe's crying..."
Ella: Gives me a "look" and tells me "Mom, she is just going to have to cry."
Eli is sweetness personified,
Ezra freaks out,
and Ella is full of practicality.
My favorite part is when they are all doing these reactions simultaneously to Zoe's crying. I'm sure you could tell a lot about my personality during those moments.
Not that this sweet little face ever cries, of course.