Female space marines would seem a bit odd because space marines lean thematically on the idea that they’re the sons of the primarchs (who are the sons of the Emperor themselves) with some genetic fuckery involved, but Custodians don’t seem like any issue at all. They’ve always just been custom-made genetic…

Wow that's good on you man. I respect that. You may or may not be a believer, but the bible does say to honor your mother and father. You're doing a good thing in helping your pops out.