I haven't, but my ex-S.O. raised his two brothers and his sister. It had both good and bad effects on his life. He felt that he was worthless unless he was taking care of someone, and that made relationships very complicated for him. On the other hand, he was really good at taking care of people. It is too back that he was divorced, because he was a wonderful father to his daughter.
I dropped out my freshman year of high school and enrolled in an online school to take care of my two infant sisters. They're 8 and 9 now and i'm still a main care giver. I also gave up a distant friend to be with my boyfriend. I disowned a person to live a better, healthier life.