Are Alec and Izzy twins?

Isabelle "Izzy" Lightwood is a Shadowhunter and the current head of the New York Institute. She is the only daughter of Robert and Maryse Lightwood, is the sister of Alec and Max, and is the adoptive sister of Jace.

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Correspondingly, how are clary and lydia related?

Trivia. While Lydia is evidently proud of her ancestor Henry Branwell, the last Branwell to run an Institute whose contribution to the creation of the Portal is well-known, Lydia made it a point to clarify that she was only distantly related to Clary (through the Fairchild-Branwell bloodline), Valentine's daughter. Who is Valentine's son? Sebastian Morgenstern, born Jonathan Christopher Morgenstern, was the son of Valentine and Jocelyn, and the older brother of Clary Fairchild. As a result of experiments done on him by his father, Sebastian was a Shadowhunter born with demon blood.

Is Michael Wayland alive?

Last Tuesday's episode ended with Jace learning that his presumably dead father, Michael Wayland, is still alive. This Tuesday's episode opened up with Michael telling his son and Clary that Valentine has kept him hostage for 10 years. Does Alec become immortal? Alec dies, so there is no reson for Magnus to become mortal. He stays immortal. Alec doesn't die, but still, Magnus chooses to stay immortal (the same with his past lovers).

Then, what is tessa's warlock mark?

Trivia. Warlocks with the same type of demon parent may have similar marks. Tessa Gray is a special kind of warlock, born of a demon and a Shadowhunter. Because of this, Tessa is a warlock with no warlock mark. Consequently, do jem and tessa have a baby? Wilhelmina ""Mina"" Carstairs is the daughter of Tessa Gray and Jem Carstairs.

Who stole the soul sword?

Before they could secure the sword, Jonathan Morgenstern stole the Sword, and the Clave tried to hide the fact that the Sword was missing from the Downworld. Valentine was eventually able to use it, along with the Mortal Cup and the Mortal Mirror, to summon Raziel.