Here is another tiny rc script
https://gist.github.com/2686516

It is an extended version of pstree. (Behaves more like solaris ptree)
It takes an option -(p|c), given -p <pid>, it prints the parents of the
pid. Given -c <pid>, it prints the children in a tree form. Would
appreciate any feed back.

ps:
  let me know if I am flooding the list.