The Ortlieb Woman (1981)

After the death of the father, mother Ortlieb tries to protect the family by reducing the family's contact to other people. Especially the love interest of the son is undesirable. With progressing time the oldest daughter takes over the control in the spirit of her mother and manipulates the complete family. Her sister seeks to get a job and her brother wants a family of his own. But their sister takes counter measures - in case of the brother with all consequences.