At a point, yeah. I live by the rule that people should help other people where they can, but temper that with a second rule; don't let life crush you, because it will try. As long as you are (genuinely) keeping it together, giving more help to the other person than the happiness they're sucking out of you, it's worth it to try the assist; a broken life can be made whole with the help of other people. However, if you're just getting squished down into a dense, stressed little cube of extended responsibility, it's time to stop. You have to look out for #1; not exclusively, but you are your own primary caregiver and if you abandon yourself, you'll wither.