Does anyone know if familiar hitpoints are hardcoded and hidden?

[Senko]

I'm trying to figure out a way to adjust the hard lock on a familiar's hitpoints but even in the ability that states "A familiar has X hitpoints" there's no script, tag or anything I can see that would actually generate that. So I'd like to avoid wasting my time if it is hardcoded and hidden. Does anyone know please if there's a way somewhere to adjust a familiar's hitpoints so I know if its at least worth continuing to look?

EDIT
To be clear I mean figment archetype ones that modify a familiars hp to 1/4. I know here the base familiar thing scripting is but thats modified by figment to be 1/4 instead of 1/2. I want to make a mythic figment that restores it to 1/2 but I can't find the figment adjustment.