no, canon is that they are unrelated to MC. (and even if they were, the power only passes down to men).If you're referring to their heritage, incest patch is unofficial so no dice there.
If you're referring to Carla still looking young despite her age and the girls inheriting that...well they still have to mature a little bit before they stop aging, no? So Cari would still have to rework them into HS2 if he wants them as a surprise cameo.
Also, I thought the point of the canon ending was that OIAL MC let go of his heritage as he had found contentment with his harem, so he might not even have powers or have them dormant if he ever shows up again.
yeah, I was only referring to them being the daughters of Carla who remained as healthy and youthful as a 18 year old
we already saw Lauren as a grown woman, about 10 years later, there is no work necessary for her. aside from the change in hair and makeup, there was barely any change.
even if he doesn't use his power, and abandons the book, he is still the rightful owner and still carries the soul fragment. the very fact that he conquered most of his harem passively shows that his power is enabled anyway. he also needs it to maintain his stamina