Buy some board games and go to the local children's hospital. Play games with the kids for a few hours. Everything else in your life takes on a reordering of priorities.

And I add the following: be happy, be positive and do not lie at all to these kids. IF things are bad, THEY KNOW. If things are good, THEY KNOW. Let them talk, let them vent, be an older brother to them, not a parent, not a friend even. If you have the resources to get involved with Child's Play and are able to donate an XBOX, Play Station etc, and can spend time with the kids, do it. Don't buy something drop it off and never show up again. Every kid who gets better and leaves the hospital will bring you joy, until you realize you probably won't see that kid again. And there will be kids who don't make it, fortunately not that many due to the advances of modern medicine. It will happen, and there is nothing you can do but work with the ones who are still sick.

There are not enough people, men in particular, willing to do this type of work. And if you can volunteer in the middle of the week rather than the weekend, even better.

http://childsplaycharity.org/ If you need something to start you off.