If you need to provide remote support to your parents, you can use a number of tools to help you.
If you have access to their computer, you can use a remote desktop tool like TeamViewer or Splashtop to connect to their machine and help them with whatever issue they're having.
If you don't have access to their machine, you can still provide support by using a screen-sharing tool like Join.Me or Google Hangouts. With these tools, you can share your screen with your parents and help them through whatever issue they're having.
You can also use a tool like LogMeIn to remotely control their machine, but this should only be used as a last resort, as it can be confusing for non-tech-savvy users.