#Izzy is supposed to be this super scientist and no one even mentioned a dna test?

[lurafita]

Magnus discovers Jace's heritage

In today's episode of 'imaginary scenes that never canonically happened but still live in my head rent free':

Magnus: "So my dear shadowhunters, what's new? Catch me up."

Clary: "Valentine is Jace's father. We are siblings."

Jace: "And he injected me with demon blood while I was still in my mother’s womb."

Alec: "He disguised himself as Wayland for all those years he raised Jace in Exile."

Magnus, sighing: "... Where do I even begin... Okay. You two are aware that you look nothing alike, right?"

Clary: "Recessive genes can do that."

Magnus, sighing louder: "...Alright, Blondie. Strip."

Jace: "What, why?!"

Alec: "Uhm, yeah, what he said." (not that he is jealous that Magnus wants to see another man naked. No sir. He is very decidedly not jealous. ... he will find a reason to shuck his shirt in front of Magnus later.)

Magnus: "This institute is protected by my wards. As is Pandemonium, as well as my apartment, which is warded even heavier. All of which you have been present in. You have been to the Silent City and were in the presence of the silent brothers. There are exactly two ways to keep demonic blood from being discovered by either angelic runes like they are at the silent city, the silent brothers themselves, or my wards. One is regular contact with a very powerful warlock to cast a very complicated spell on you. As I doubt you have been seeing one for every month of your life, that leaves number 2. Which is a demonic mark, which can only be given by a greater demon, and can only be seen by those who know it and are actively looking for it. So, off with those drab clothes so I can take a look."

Jace: strips

Magnus: sees the Herondale birthmark, sighs and starts to write a fire message

Alec: "What are you doing?"

Magnus: "Informing the Inquisitor that she has a grandson. 'Congratulations, it's a boy!'"