1. From the Law Review you linked, section I A. The Rule : "The doctrine, although subject to many exceptions, allows minors to disaffirm or "void" a contract that they entered as a minor."
In other words, if a minor signs a contract, the Infancy Doctrine allows them to void that contract. It does not mean that a contract signed by two adults is voided by the children of those signatories. The children of a married couple have not entered into that marriage contract.
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Dude there are 35 pages of quotes from that link in post #4. You cherry picked one sentence to represent the comprehensive whole of that document? You're hilarious. Yes, that's true about children actually signing a contract with adults. But there are IMPLIED contracts as well, not just expressed ones. And unless you or one of your buddies here is going to lie and say that implied contracts aren't equally weighty or enforceable as expressed ones, you have to admit that implied = contract.
I'll rebut the remainder of your point thusly: Children are absolutely anticipated when the word "marriage" is spoken. You would have thousands of years of precedent against you to assert the opposite. In fact, your cult often brings up the intrinsic bind of children to the word "marriage" and even pushed Kennedy to "do it for the children"...when not all gays had children or even wanted them...who sought to be married. Following the link in the OP here to the Browns case for polygamy, just count the number of posts from mdk, Skylar, Syriusly and other LGBT apologists here at USMB that say "polygamy can't happen because of the children". You can't walk both sides of the fence like that. I'm drawing a line in the sand.
So since WE ALL AGREE THAT MARRIAGE ANTICIPATES CHILDREN AND IMPLICITLY INVOLVES THEM, we have to look at how a marriage contract that strips them of the hope of either a mother or father for life, fits into the broad spirit of the Infants Doctrine. That being said, I will leave you with another quote from the OP:
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Any contract which a court deems to be detrimental to the interests of the child is void, plain and simple. It is not voidable - it is void. It is as if it never existed. Of course, this takes a court order to achieve but it is an important deterrent to commercial hustlers who would not hesitate to extract money from a child.
Contracts With Children