Caretaker

Andrew didn't need to explain that his money was tight after taking impeccable care of his ailing wife for many years and not going out to work. He spared no expenses for her. But he added more about his money situation. 

"I supported my sisters for way too long. Like my mother, they were helpless. One is an alcoholic and can't hold a job. I helped them out like they were still my kid sisters. I finally had to cut that out and now they barely speak to me." 

What led Andrew to take care of his sisters for so long?