Got inspired - Luke and Leia have an older sibling who is an utter monster. Maybe Palpatine got to this child first, or they're just spoiled/favoured by Vader in a materialistic way but not an emotional way, or maybe they're just a dick all on their own.
All the children are raised by Vader. The twins are terrified of their sibling and try their best to keep away from him or her, because they know that soon Palpatine will turn his attention to the two of them. Ironically, it's their sibling's cruelty that inspires the twins to care for each other, and vow to resist the dark side at all costs.
The older child maybe has an erratic temper and is all for the sadism but struggles with rules and respect and stuff. To Vader, they're technically a disappointment (but he's only just sort of figured that), but to Palpatine they're a wonderful weapon. Think of like an ultra-Kylo Ren with double the anger and entitlement issues.
Then, maybe the older sibling is taken away for training by Palpatine, killed by him, or assassinated (bonus for this if it's pissed off Imperial officers who this kid ridiculed). Vader's attention is forced onto his two younger children, who have pretty much raised themselves in the loneliness of Imperial warships and courts. But the twins have run away, fearful that the assassin will come for them, or that their Sith training will now begin.
Don't mind if there are pairings, but I'd love to see the twins join the Resistance, but struggle being around all these other people. Meanwhile Vader angsting over the loss of his babies and actually taking responsibility for his lack of input with his younger kids.
TLDR: Luke and Leia are raised by Vader, but they also have an older sibling who is sadistic and cruel. The older sibling gets the focus of Vader and Palpatine, but after he or she is murdered or taken away, the twins escape the Empire to join the rebellion.
Gen or Any/Any, Luke & Leia have an older evil sibling, abuse/neglect/murder mention
All the children are raised by Vader. The twins are terrified of their sibling and try their best to keep away from him or her, because they know that soon Palpatine will turn his attention to the two of them. Ironically, it's their sibling's cruelty that inspires the twins to care for each other, and vow to resist the dark side at all costs.
The older child maybe has an erratic temper and is all for the sadism but struggles with rules and respect and stuff. To Vader, they're technically a disappointment (but he's only just sort of figured that), but to Palpatine they're a wonderful weapon. Think of like an ultra-Kylo Ren with double the anger and entitlement issues.
Then, maybe the older sibling is taken away for training by Palpatine, killed by him, or assassinated (bonus for this if it's pissed off Imperial officers who this kid ridiculed). Vader's attention is forced onto his two younger children, who have pretty much raised themselves in the loneliness of Imperial warships and courts. But the twins have run away, fearful that the assassin will come for them, or that their Sith training will now begin.
Don't mind if there are pairings, but I'd love to see the twins join the Resistance, but struggle being around all these other people. Meanwhile Vader angsting over the loss of his babies and actually taking responsibility for his lack of input with his younger kids.
TLDR: Luke and Leia are raised by Vader, but they also have an older sibling who is sadistic and cruel. The older sibling gets the focus of Vader and Palpatine, but after he or she is murdered or taken away, the twins escape the Empire to join the rebellion.