Holidays are also an opportunity for kids to unlearn every good habit they've learned during the rest of the year. They don't go to school. They get to stay up past their bedtime. They get candy and presents for doing nothing. Childhood utopia.
I know now that before I take a picture I have to be sure about how I feel about the subjects. What I don't know is if I should explain to them what I'm doing while I'm photographing them.