chapter 14 could be interesting.
Although the teaser shows the map for spirit, they can take this anywhere. It could be a family member of rins but not necessarily recent.
This brings up many things, maybe rin had a distant relative that was actually oni, or maybe just evil. Might be why her father is the way he is.
Rins father could've been possesed by a demon, maybe even the person who is linked to the mask, and a sacrifice is what could finally bring him back, and rin was the sacrifice.
Who knows, put what you think below :)