If you have never seen this BBC production of Merlin, you are in for a treat. My youngest daughter started watching it on Netflix last summer and literally consumed it in a very short time. But, the rest of the family got hooked on it as well.
It's such a great show! Merlin is this awkward magician who winds up as the servant to the prince of Camelot. The king is afraid of magic and has banned it from his kingdom. But of course Merlin uses his magic to save the prince over and over again, all without letting the king know.
This is a great series and is relatively family-friendly. There are to be scenes that will be very emotional, and intense, so I wouldn't recommend it for anyone under 10. And even for 10+ it might depend on how sensitive they are.
All in all, this is an awesome series! Be prepared to get hooked!