Loved it as a kid, loved it as an adult!

I remember loving Half Magic when I read it, I think, in fourth grade.  I absolutely loved rereading it!  The whole thing is very funny and irreverent in places.  So great!  A family of three girls and one boy find a magic coin that will grant them what they want, but only half of it.  Before they figure that half-part out, some seriously bizarre things happen.  Bizarre things happen even AFTER they figure it out.  I didn't know that this was a series, but I will be reading the next!