This Sunday, April 10th, is National Siblings Day, and as someone who has an older brother, I get VERY, VERY creeped out by TV siblings that have sexual relations. Just typing those words nauseates me. I realize that the actors themselves are not actually related, but I still do not like watching it at all. This is my list of characters who have inappropriate family relationships.

1. Cesare and Lucrezia Borgia – The Borgias, played by Francois Arnaud and Holliday Grainger.
From the beginning of the series, Cesare and Lucrezia were always way too close, and often jealous of each other’s love interests, but it was not until the third season that they took their relationship too far. These characters are based on real people and their incest was merely a rumor at the time, people thought that Lucrezia’s first child was in fact her brother’s.

2. Claire and Bryan Robbins – Flesh and Bone, played by Sarah Hay and Josh Helman.
At first, it seems like Bryan had previously raped Claire, and she has come to New York because she is trying to get away from him. But when he tracks her down, she seems to need him near her and also wants him to leave at the same time. Eventually she sleeps with him voluntarily, so it is hard to say exactly what is going on with them. Either way, it is weird and gross.

3. Cersei and Jaime Lannister – Game of Thrones, played by Lena Headey and Nikolaj Coster-Waldau.
Not only are Cersei and Jaime twins, but all of Cersei’s children are Jaime’s and do not belong to Cersei’s husband, King Robert Baratheon. In the very first episode, Jaime pushes Bran Stark out a window and, at the end of the first season, they have Eddard Stark beheaded in order to keep their secret. Before his death, Ned discovered that they had his predecessor as Hand of the King, Jon Arryn, and King Robert killed as well. Cersei also has several affairs with various Lannister cousins.

4. Helene and Anatole Kuragin – War & Peace, played by Tuppence Middleton and Callum Turner.
In Tolstoy’s novel, this relationship is merely a rumor. However, in the first episode of the mini-series you actually see Anatole climb into bed with his sister, while simultaneously talking to her about their father wanting to find them appropriate marriages. It may be a relatively short scene, but still creepy, none-the-less.

5. Jax Teller and Trinity Ashby – Sons of Anarchy, played by Charlie Hunnam and Zoe Boyle.
To be fair, they did not know that they were half-sibilings when they started making out. Luckily, their mothers intervened before things went too far into “Tig territory,” as Jax puts it. However, for me, the flirting that leads up to the making out is equally creepy because, as the audience, we know they are related.

6. Krista and Danny – Friends, played by George Newbern and Julie Lauren.
They never actually sleep together, but they touch each other inappropriately and appear to take baths together often. Of all of these relationships, I actually find this one to be the worst because, even though you do not see them cross that sexual line, they also do not understand people’s reactions to their behavior. At least everyone else on this list seems to know that they are doing something wrong.

7. Daenerys and Viserys Targaryen – Game of Thrones, played by Emilia Clarke and Harry Lloyd.
I usually try to restrict myself to one thing per show, but Game of Thrones has two sets of creepy siblings that I felt needed to be addressed. (And actually, Yara and Theon Greyjoy could also make the list). Nothing sexual actually happens between these two (that we know of), but Vicerys treats his sister as a sexual object, often touches her inappropriately, and offers her up to Khal Drogo and his army.

8. Cathy and Christopher Dollanganger – Flowers in the Attic/Petals on the Wind/Seeds of Yesterday, played by Kiernan Shipka & Mason Dye, Rose McIver & Wyatt Nash, and Rachel Carpani & Jason Lewis.
Yes, there were three different Lifetime movies about this family, with three different couples playing the siblings at different ages. Throughout their story, they attempt to have real relationships with other people, but by the end of the second movie, they are married and pretending to the world not to be related. Their mother and father were also siblings, so they did not really stand a chance at a normal life. I also have to say, there was a fan video of Cathy and Christopher’s relationship on YouTube that said “for my boyfriend” in the title, which creeps me out even more than the characters themselves.