Somehow I don't think that the curses are passed from one generation to the 
next. And even if they were, you can't have 1/4 unless you have 4 forms. If 
you wanted to make the curse weaker (because of one un cursed parent) you 
could change the water temperatures needed. Say that the cold water has to be 
COLD to change into the cursed form, and (depending on which way you feel like 
working it out) that it takes lukewarm water to change back to the original 
form. If you want an interesting effect, make the 'hot' water temperature too 
high for the cursed form to withstand, making it painful to change back.

 well, we're discussing this because we KNOW some curses are.
re: mint and lime. they were never cursed. their parents were a male
and an animal that had been cursed and then splashed with a water
to KEEP them in their cursed-female forms. and they have some of
the animal characteristics of their parents.


 ..and re your temperature ideas, set the cold-water changing
to well below freezing ^_-
        
                        -evilme