Many people harbour suppressed anger, guilt and resentment towards their parents. These are toxic and can manifest as various physical, psychological, and spiritual ailments.
Truth is, that your essence chooses your parents, YOU choose your parents.
All of the tensions resulting from your relationship with them are part of your souls path. The first thing we must do is realise that we chose them, then to realise that they are people just like you and me, with their own histories, flaws and egos.
Ask them about their childhood, maybe you will learn that they are manifesting parts of their ego that exist due to their specific upbringing.
All that has happened in the past, it is gone.