No, Alec does not break his parabatai bond with Jace; the bond is extremely powerful and is only truly severed by death or extreme transformation (like becoming a Silent Brother). While Alec experiences intense pain and disconnection when Jace is in danger or possessed (like being controlled by Lilith in the show), the bond itself remains, and Alec even becomes a source of strength and healing through it, as seen in the show's final season when he helps Jace.
A Shadowhunter may choose only one parabatai in their lifetime and cannot perform the ritual more than once. Like the marriage bond, the parabatai bond is broken only by the death of one of the members of the partnership. Silent Brothers: The Brothers serve as the keepers of lore and knowledge.
The possessed Alec killed her, and she was later found by Clary. Unable to get over her death, Clary tried to resort to Iris Rouse's dark magic to bring her back but backed out before she could be resurrected.
Alexander Lightwood was only 19 years old when he died in the fight with the demon. He was innocent, he had pure heart so he got into Heaven right after his death. Alec has been included in numerous ranks of Raziel's angels and he started his eternity, the time passing slowly or maybe fast, he has no clue.
However, Alec finally acknowledged that marrying Lydia when he would never love her was not the right thing for either of them and faced his feelings for Magnus by kissing Magnus in front of his family, friends and envoys from the Clave, effectively calling off the wedding.
Isabelle was ecstatic to be getting married to Simon and told him that she wanted an engagement party in two days—to coincide with Max's birthday—which Clary managed to pull off.
A vampire's abilities also grow stronger with age and experience. Some examples of this are Simon Lewis who is only 19 years old, Raphael Santiago who is around 80 years old, and Cain who is thousands of years old, and the most powerful vampire in existence.
In present day, Christopher would be considered on the autism spectrum. He was initially intended to have the nickname "Chris" by Anna and Matthew but this was seemingly changed to "Kit".
After disobeying the Angel's orders, Clary was stripped of her runes and was thought to have been transformed into a mundane. However, Clary is still a Shadowhunter as she was able to see Jace even though he was glamoured revealing that she still has her powers.
The choice to kill a character that lives in the books is also to keep the show exciting and to keep all the fans guessing. For the executive producers, Jocelyn's death felt necessary to raise the stakes and to be able to move the core cast forward.
Throughout all this time, Valentine never stopped loving Jocelyn. At some point, he obtained an inter-dimensional apartment and had a room and clothes prepared for her, just in case she ever decided to come back to him.
Later that year, Lilith used oneiromancy in order to possess Jace Herondale. She repeatedly sent him dreams of him harming or killing Clary, driving him mad with guilt.
The Inquisitor later confirmed this herself and and stated that if the Cup was not returned to the Clave within 24 hours, Izzy would be stripped of her runes and exiled. Jace and Clary later returned with the Cup, having completed their mission with it, freeing Isabelle of her charges.
Sometime in 2016, Lilith had this owl possess Jace Herondale—a recently-resurrected Shadowhunter who was left vulnerable to demonic influence—and use his body as a vessel. The demon was only able to take over Jace during his sleeping moments because his love for Clary Fairchild overpowered the Owl's love for Lilith.
Raphael did not leave Heidi to die, however. Knowing that she likely had Simon's blood, he took her from the morgue and helped her Turn. Hoping to find a way to become a Daylighter through her blood, Raphael kept her in the Dumort.
Clary is still 16 because she has to wait 6 months until she is 17 (Jace is 6 months older than her).
Alexander Gideon "Alec" Lightwood is Nephilim. His sister is Isabelle Lightwood and his younger brother is Max. His parents are Maryse and Robert Lightwood and in his family tree you can also find the Penhallows, though the Nephilim race is so old that almost all Nephilim are related to one another.
Lilith taking a sliver of Clary's soul. Lilith summoned a demon to collect a sliver of Clary's soul, letting it track Clary by scent. The demon ended up tracking Isabelle Lightwood, who had been wearing Clary's dress, instead. She soon felt the death of the demon, prompting her to make a move on Clary herself.
Jane is Alec's twin sister. Aro had an eye on them for a while, but when the village thought that they were witches they tried to burn them on the stake. Aro killed every villager and changed Alec and Jane into vampires.
Immunity to the sun: After drinking Jace's blood a Shadowhunter with additional, pure angel blood—Simon became impervious to the typical vampire weakness to the sun and thus gained the ability to freely walk in daylight. His blood also protected him from the power of the Soul-Sword.
Simon lives, but the sun is rising as they escape Valentine's sinking ship. Strangely, the sun doesn't harm him. It seems that Jace's blood has made Simon immune to the sun.
Listen, I know that, in the books (and in most fics), Clary loses her virginity to Jace.
Magnus Bane is the High Warlock of Brooklyn. Being over four centuries old, his life has since intertwined with several Shadowhunters and Downworlders over the centuries. As of 2012, he is the husband of Consul Alec Lightwood and the adoptive father of Rafael and Max Lightwood-Bane.