How are Jason and Tyland Lannister related to Tyrion Lannister?

After focusing almost exclusively on the Targaryens, Hightowers, and Velaryons for its first few episodes, House of the Dragon finally introduced us to the prominent members of House Lannister who were alive during this earlier time period of Westeros. While Thrones had several prominent Lannisters as main characters, such as Tyrion (Peter Dinklage), Cersei (Lena Headey), Jaime (Nikolai Coster-Waldeau), and their father Tywin (Charles Dance), House of the Dragon is starting us off with a couple of Lannisters as minor players: twin brothers Jason and Tyland, both played by Jefferson Hall. Yes, twins run in the family (as does snark and alcoholism).

In many ways, the brothers are exact opposites. Jason is the Lord of Casterly Rock and so full of himself that he never comes off as anything less than amusingly arrogant. Tyland, by contrast, is the dutiful younger sibling who has risen on his own merits to become the Master of Ships on King Viserys’ Small Council. Both of these Lannisters have a role to play in the wars to come, so best get used to them now.

If you’ve been keeping up with House of the Dragon, you may be wondering how exactly Jason and Tyland are related to the Lannisters we know from Game of Thrones. Let’s break it down.

How are all these Lannisters related?

Given that the bulk of House of the Dragon takes place around 170 years before Game of Thrones, a few generations separate Lannisters like Jason and Tyland from their more modern counterparts.

Before Aegon the Conqueror came to Westeros, the Lannisters were kings in their own right. After being forced to kneel to Aegon, they eventually became integral power players in the realm by the time of the Dance of the Dragons, when Jason is the reigning lord of the family. During the Dance itself, both Jason and Tyland will side with the Greens, which we can already see the seeds of during Jason’s interactions with Rhaenyra in “Second of His Name.”

Following the Dance, Jason’s son Loreon takes over as the Lord of Casterly Rock. After that, Loreon’s son Damon becomes the head of the family. Damon was known as the Grey Lion, and ruled House Lannister during the era of the first Dunk & Egg story, where he and his eldest son Tybolt participated in the tourney at Ashford Meadow.

However, Damon wasn’t lucky enough to live to old age. By the time of the second Dunk & Egg tale, The Sworn Sword, Damon had passed away from a plague known as the Great Spring Sickness. After a few murky shifts of succession, Damon’s youngest son Gerrold ended up as the Lord of Casterly Rock. Gerrold was none other than the grandfather of Tywin Lannister.

This means that Jason Lannister is Tywin Lannister’s great-great-great-grandfather, and the great-great-great-great-grandfather of Tywin’s children. Now that’s a lot of greats.

House of the Dragon premieres new episodes on HBO and HBO Max Sundays at 9:00 p.m. ET / 8:00 p.m. CT.

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