I have to draw some boundaries ! I have moved them closer to me, twice as they did not want to go to independent living so built them a patio home then 2 years later moved them again!
They are in search of something, most likely their youth. They think happiness is somewhere else. Happiness is either inside you, where you are or it does not exist at all. So draw the line now. Tell them to find happiness by wanting what they have because they are not getting any more.