Newbie WDTV streaming from offsite NAS?

Sorry for the newbie question.
About to pull the trigger on a Synology DS213 and 2 WDTV. Setup 1 WDTV for myself on home network and 1 box for parents living in another country. Question is can they access and watch my collection over the internet? If not any other ideas for the parents to stream media with a dedicated media player?

Thanks for the help


Ok understand WDTV can’t stream from an offsite NAS.  Any other ideas of another unit that can do it?