That's correct, because families are one constituent part of a larger society, so families themselves are profoundly impacted by all of the other forces in society.
For example, I'm a father. My wife and I have a 13-year-old son, and clearly I am the most important man in my son's life. I know I've had great influence on my son's life, but everything that has influenced me influences my parenting of my son. So what influences me is not just my linear experience of my stepfather; it's also my peer culture, my mother obviously, my sports culture experiences, my consumption of media. Everything about my life as it is impacts how I father my son, so there's no such thing as a family that's isolated from the larger forces at work.