AU: Tywin and Joanna Lannister had a son in between their twins and Tyrion, his name is Jason Lannister named after his maternal grandfather.
As a young child, Jason swore to his mother to protect his newborn baby brother Tyrion from any harm as any...
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Bio: Third born child and second son of Tywin Lannister and Joanna Lannister, his mother named him after her own father, as a young boy he was close with his older siblings Cersei and Jaime who are three years his elder. However it all changed once their mother died giving birth to Tyrion, Jason's younger brother by six years, having promised his mother weeks before her death he will protect his newborn sibling as any older brother should. Unlike his sister or father who blamed Tyrion for Joanna's death, Jason adored his little brother and be his true protector unlike Jaime whom the two elder sons of Tywin Lannister grew astray over the years.
Jason will be at odds with his father and sister as the years go by due to their cold treatment towards Tyrion, he did squire for his Uncle Tygett during Robert's Rebellion and remained in Casterly Rock.
He eventually married a distant Hightower he met during a Tourney, giving birth to a daughter whom he named after his mother Joanna. Sadly his wife will die a few years later under mysterious circumstances and refuses to remarry despite his father's request. After hearing of the 'Tysha Incident' by Tyrion, Jason in rage would sire a bastard named Tytos and would easily convince King Robert to legitimize the child to mock his father.
During the War of the Five Kings, Jason went with Tyrion to King's Landing and aided in the Battle of Blackwater Bay, however after an incident where he infamous backhanded his nephew Joffrey for his idiocy. His father would force him to marry Sansa Stark or else he will have Tytos killed and have Joanna sent to the silent sisters and have Tyrion sent to the Wall, knowing his father meant the threat, Jason agreed on the condition he had a part in the small council.
When Tytos returns to King's Landing missing his right eye, Jason will vow to kill Walder Frey for maiming his son.
Lady Joanna Lannister II.
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Bio: Only daughter of Jason Lannister and unknown Hightower who died a few years after her birth, her father named her after his own mother whom he spoke highly of and felt her grandmother would have adored her. Despite having the Lannister golden hair, she inherit her mother's brown eyes, something Cersei would always mock her niece for having, which led to a massive fight between Jason and Cersei. She is also the older half-sister to Tytos Lannister, formerly Hill.
