Two books in one: If There Be Thorns and Seeds of Yesterday, from V.C. Andrews's classic series that begins with Flowers in the Attic.
Flowers in the Attic (Dollanganger Series #1)
Petals on the Wind (Dollanganger Series #2)
Delia's Gift (Delia Series #3)
Secrets in the Shadows (V. C. Andrews' Secrets Series #2)
Secrets in the Attic (V. C. Andrews' Secrets Series #1)
Delia's Heart (Delia Series #2)