The most recent books written by V.C. Andrews are "Secret Brother" and "Echoes of Dollanganger," which were published in 2015. "Secrets of Foxworth" and "The Unwelcomed Child" were published in 2014.
"Secret Brother," "Secrets of Foxworth" and "Echoes and Dollanganger" are part of the "Diaries" series that relates to the "Dallanganger" series. The "Dollanganger" series was her first published series and it is about children of the Dollanganger family. In the beginning of the series, the kids are imprisoned in an attic by their mother and grandmother. The kids eventually escape, but one of them dies before they get away.