This episode was really good. I've only seen it once and that was last year, so some of the details may be a little sketchy.
In this episode a young boy comes to the SGC. He's not very well and is dying. His Mom is aparently a Reetou. SGC encountered the Reetou before. It was not a good experince. They had to fight the Reetou back off the base.
The kid conects with Jack and near the end of the episode Jack almost adopts him.(The kid also took on the name of Charlie - Jack's son who died a few years back.) Jack would have adopted him too if Charlie didn't leave to lve with the Tok'ra. The Tok'ra symbiont healed Charlie completly.
This is such a great episode and a finer example of the series.