In this story Arthur, Molly,Narcissa and Lucius are all in the same year at Hogwarts.
Originally Arthur finished in 1968,
Molly - 1967,
Narcissa - 1973
Lucius - 1972

This may change some timelines but I will try too stay as true to the story as I can.
Comment on the pairings you want:
Lucissa - Lucius & Narcissa
Marthur- Molly  & Arthur
Arcissa- Arthur & Narcissa
Lucina- Lucius & Gaina
Fralice- Frank & Alice