I disagree. There was a lot of selfishness, but there was much more alcohol abuse, and pent up anger.
It just wasn't a factor in my family's dysfunctional history. Selfishness was. One set of grandparents decided they didn't want to be married any more, and damn the kids. The other set didn't want to do more than the absolute minimum necessary to raise their kids - my dad has a story of being left in a hotel lobby with a broken leg while on a skiing vacation for a whole day.