Linux Processes
Process Parent
ps -o ppid= -p <pid>
Process information
ps -Flww -p <pid>
On Linux, top
actually supports focusing on a single process, although it naturally doesn't have a history graph:
top -p <pid>
This is also available on Mac OS X with a different syntax:
top -pid <pid>
See also pidstat. (part of sysstat package)