In a nutshell the episode, Uncle Boutros (Peter), tells the story of 2 brothers told by their father on his deathbed that their maternal family hails from Lebanon and that they should seek out their uncle in Lebanon. They duly travel to Lebanon and discover that their mother's side of the family is Christian. To top it all of f their uncle, Boutros (Peter) is a priest!
The 2 attend a wedding in a church and join in the celebration. Meanwhile the brothers engage in dialectic soul-searching, wondering how their impressive uncle is a kafir (infidel) as they'd been taught of non-Muslims. They gift him a copy of the the Quran hoping to guide him to the path of Islam and he displays to them a profound knowledge of Islam as well as respect for and belief in all religions while maintaining his own religious convictions.
I'm very impressed with the courage and treatment of this very delicate subject. The two stars, Abdullah al-Sadhan and Nasser al-Qasabi, deserve a lot of credit and support. This is the program's 17th season. More about Tash here.