As can be told in the setting, the human parents of any White Court vampire children don't tend to live long (even with what happened with Margaret, who left without her son). With the House they belong to taking full custody and rearing their progeny how they see fit.
However, this has made me wonder: If the human parent somehow did live long enough and flee with the child too: would they be able to actually try make any legal measures within the supernatural community, to try prevent that House from getting custody of the kid even if something were to happen to them?
They can't take it to a human court with the truth of the situation. And even if they did get the family barred through other mortal legal means/excuses - that's not going to be respected.
But, the supernatural world does seem to at least have precedent with trials and legal cases and would at least certainly believe the parent (and possibly be more respected in their verdict).
So, within the described lore of the setting, is there anything that would indicate a way for a person to attempt to start a court case on a matter like this about custody of a white court child? For instance there being a specifically described someone they could go to/protocols followed/things done?
Disclaimer: I don’t think they’d succeed with the case, with who they are up against, but this question is specifically wondering if there's anything on if even an attempt would be possible.