The stipulation I'd have a problem with is that the parents must attend parenting classes.
What makes the State think that they NEED parenting classes? And until the State proves otherwise, they've broken no laws requiring them.
Good parents don't marry off the 13 year old daughter (of wife number four, pastel pink) to a drooling old holy-joe pervert.
Just curious, do you believe that marriage should be between one man and one woman? Do you believe that "Heather Has Two Mommies" is a good environment for children to be brought up in? How about "Heather Has Six Mommies" and they're all fighting for necessities for their own children within the communal home?
At the very least the polygamy lifestyle goes against the "One man and one woman" marriage laws.