This is just an idea that I had and I know that this isn't the most popular movie, so I'm not sure if anyone will read it. You don't really need to have seen the movie to understand, the basics is that there was a family that got cursed and turned into fictional monsters but in the end they got turned back into humans.

I own nothing

It has been years since the curse was "lifted", but unknown to us at the time was our monster side could still slip out. At first it was only when we were very upset or sad or any kind of negative emotion but it soon moved on to all emotions. People often whisper about the emotionless family but we don't respond to their rumors because that could cause emotion. We learned to control it enough to show emotions again, but we still do it most of the time as a precaution. We also learned to change back and forth at will but it takes a lot of energy and concentration.

Oh my, where are my manners? I should introduce myself. My name is Max and I'm a werewolf. My mother is a vampire named Emma and my father is Frank, our local Frankenstein, my 100% annoying sister Fay is a mummy, and finally me, a werewolf as I previously mentioned. And today is my first day of high school.