No, no dysfunctional family, there were things of major importance that didnt go right in the young adult’s life, despite parents’ huge efforts.
Young adult chooses to have nothing to do with parents, but might, down the line, have some contact with siblings.
Why do I doubt this story?
People who have a good relationship with their parents don’t cut off contact from them.
I assume they are not good parents, and probably don’t have a good relationship with each other either.
Despite their outward appearances.