My oldest son unexpectedly passed away in May at the age of 15. Since 2004 we have taken a yearly trip to WDW and it has always been during the school year. Some trips were missing a few days and a few trips were 10 days.
I would get nervous about how school would comment on pulling the kids out and how they would catch up on homework. Some years it was a struggle. But looking back at it now I would NEVER second guess a decision to pull my kids out of school for a family trip. I don't care if it was to just go to the local zoo. Sorry, but they can throw me in jail. Family memories are more important as I have found out. In the end, that is all you have are memories.
Take the trip and don't look back.
Sarah