Resolved questions
Word choice "in" vs "during"

I actually think that "in" and "during" could be interchanged. In the example that you gave I think that "during" could be used if you changed the word that follows it. As in, "I hope you're having a good time with your family during this holiday season." I personally don't think there's a difference in using "in" or "during" so I'd also like to see what others have to say.

There is a difference between "in" and "during."

For example:

"I sleep during history class."
"I sleep in history class."

In this case, If you use "during" it implies the time in which you sleep; and if you use "in" it implies the location in which you sleep.

"I exercise in the morning." This means that you exercise at a specific time: the morning. The morning is a specific place in time.

"I exercise during the morning." This would mean that you exercise throughout the morning.

Basically, "in" implies a location; and "during" implies a time.