Gülsüm Semin's brother was sentenced to nine and a half years behind bars, while a 32-year-old Russian accomplice was given seven and a half years by the court in Kleve, western Germany, a spokeswoman said.
On March 2 the young woman, who had recently had an abortion, was lured to a patch of wasteland where her brother and the accomplice strangled her with a cord and beat her in the face with a club and a tree branch, the court found.
The woman had been in conflict for some time with her family because she had chosen to adopt a "Western" lifestyle that was incompatible with the traditional Muslim way of life as seen by her father, police said.
She moved in with an Albanian man but then moved back to her family in late 2008, when she refused an arranged marriage with a relative. The same day as the murder, the brother had discovered that her sister had had an abortion.
The father, named in media reports as Yusuf Semin, was found by the court to have been the main instigator and convicted of murder. Arrested on April 1, the brother confessed but the father denied any involvement.
Newspapers named the accomplice as Miro M.