Active Family Sims left home while one is on vacation

OK So I found out that school performance does in fact decline while one active sim is away on vacation and other people are home. Sim teen is down to OK, but nearly in the red. He's still a B student but only because he's got the Genius trait. But you CAN go and switch control to the sim and force them to do homework and then switch back to the sim on vacation. I don't know if that would count for the next day or not though when school comes around.