SOLVED. YA book about 2 sisters (virtue-based names e.g. Charity etc.) who live at night time with their father (?) and servants in a house - they escape the permanent night living at the end [s]

[Ellen]

I read this book in the 2010s.

The sisters have names along the lines of Constance/ Charity/ Faith etc. so virtue names - I don't remember exactly what the names were but there were 2 sisters.

I think the living in night time was somehow connected to the death of their mother.

They go to bed as the sun starts coming up and return back to normal living at the end.

Thanks for any suggestions!

[Marika]

This sounds a lot like Century by Sarah Singleton.

[Ellen]

Yes, thank you!

[Rainbowheart]

Century for the link.