Eve of the Evolution Revolution

And we can see the impact of incestuous grooming on Marie, how she cleans and cooks for her father and older brother:

And when she talks about leaving her caretaker role, her brother stamps her down under the pretext of family. "What are me and dad supposed to do if you move" and "why are you deciding that on your own?" implies that Marie's own autonomy doesn't matter, because she is inextricably tied by blood.

The father's enabling is a huge factor. He covers up the abuse by saying "nothing happened." This, again, is another aspect of incestuous abuse. In order for him to keep up the guise of a "normal family", he ignores and hides all abnormalities. Because family is sacred and perfect. And anything behind the scenes that indicates otherwise is an affront to the familial structure.