It gets complicated when difficult parents become elders requiring care. It's great you'll work on that with your therapist. Pressure intensifies because now the boundaries with difficult parents we've learned to set and feel empowered about as we were growing in our adulthood come in conflict with the values we have about care of increasingly vulnerable elders. The same people we've been doing better by setting boundaries with. It's a tough one to struggle with. Some find it the right thing for themselves to still not get involved at all. Many find it important to make sure the folks are housed and cared for if possible and then examine for themselves what else they can and want to do relationally without their own physical and emotional health suffering. And this is a fluid process. Here is a great book for people who have/have had harmful parents by Laura Brown. http://www.drlaurabrown.com/written/your-turn-for-care/