Maybe your parents didn't get along so well. Maybe, once you got older and noticed, your grandparents had very similar issues.
We can't choose the families we're born into, but we can take note of what existed before we came along.
Mark Wolynn, creator of the Family Constellation Institute, writes of "inherited family trauma" in his book It Didn't Start With You.
He visits The Exchange to flesh out the concept of inherited family trauma and how we can deal with it.