As a matter of law, children are not "third party beneficiaries" of the marriage contract. The only legal relevance of the designation "third party beneficiary" is that the third party has the right to enforce the contract. Those are the kind of contracts wherein the contract is made for the express purpose of benefitting the third person.
I've searched the law looking for anyone, any court, any law that says that children are third party benefices of the 'marriage contract'. I've found absolutely nothing. Not a single state law, state ruling, federal law or federal ruling that has found this.
There are implied obligations between
parents and child, namely support. But none I could find regarding marriage and any implied or explicit obligation to children. Nor any recognition of children as third party beneficiaries to marriage.
I've even found courts that found that marriage was a three party contract between two people and the State.
But never two people and their children.
It appears Sil pulled this sideways out of her ass.
Define marriage and you find that:
Marriage is a socially or ritually recognized union or legal contract between
spouses that establishes rights and obligations between them, between them and their children, and between them and their in-laws.
How about when 2 parents die? Who gets their money? Clearly the children are the closing living relatives and beneficiaries of the estate, no? Why not the parents? They are just as close with mom and dad as the kids are.
Sealybobo: Your state statutes define marriage, the obligations of spouses under the marriage contract, and the obligations of parents, etc. Children and in-laws are not parties to the marriage contract.
There are many areas of the law, however, that touch upon the subject of marriage and the parent-child relationship. For instance, laws related to paternity, support, probate, intestate succession, etc., establish rules. Some of those rules are default rules. For example, if you don't leave a valid will, then your state statutory rules governing intestate succession govern. And that should answer your question on "who gets the money."
I am not aware of any laws in my state that endow any rights or impose any obligations upon me with respect to my in-laws, e.g., my husband's parents or siblings.