” One should never drown themselves in others lack of responsibility for that will never gain anyone anything.”
Life is complicated enough for each individual. When you take on the rsponsilbilty of another person you only complicate your own circumstances even more. Those choices will never allow you to gain more for yourself in a positive way, but only burden your lifee to a deeper degree. Try being a voice of reason for the one that suffers from lack of responsibilty then hopefully both of you will gain so much more in a positive way.