Why "Maternal Lien"

Globelens talks about my Maternal Lien article. He latently expresses some confusion as to why I call it a "maternal lien"

I guess my background in the title industry and transactional law make me use esoteric language. The idea is that the debt owed by the child to his1 natural mother would be a super-priority over all other debts, even secured debts like a mortgage or car. Nor will Bankruptcy discharge it, just like taxes or a student loan. Also, upon more egregious instances of non-payment, all the property of the son1 can be leveraged to satisfy the debt.

1 I am not gender neutral in my writing, nor do I intend on becoming that way soon.