We live in a culture permeated by therapy, one in which people are eager to apply psychotherapeutic concepts to themselves and their closest relationships. That includes, naturally, the relationship with our parents. But the desire to understand the hows and whys of our parents’ emotional influence is hardly new. Indeed, a classic poem by Philip Larkin, “This Be the Verse,” was buzzing around my mind as I prepared for this interview with the clinical psychologist Dr. Lindsay C. Gibson, author of the book “Adult Children of Emotionally Immature Parents.” Larkin’s poem begins like this: “They mess you up, your mum and dad./They may not mean to, but they do./They fill you with the faults they had/And add some extra, just for you.” (Poetry aficionados will notice I swapped in a clean word for a foul one. Forgive me, Philip.)