With Fujiwara not even bringing up his dad at the beginning, it makes you wonder if he's in the alive but separated category, or if he ends up being a yokai/ghost himself.
Mom is interesting enough on her own though. It seems implied she was at the very least suspicious of the girls being yokai with the rice ball stunt, so I'm excited to see a deeper family dynamic to unravel going forward whenever the author wants to tug on that plotline.