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okay you’re getting a mix of modern and canon for this one lmao
so I think the most important thing ( and this works for both verses ) is just how protective Jack is of his little sister? and this really derives from the fact that Jack felt extremely responsible for her growing up ( whether Maria was alive for much of that or not ). particularly where they’re separated from Teague, Jack feels as though he has both his mum and his sister to look after so it gives him this weight of responsibility tbh. so basically, even though he knows Izzy can take care of herself, Jack still goes into protective big brother mode if and when anything happens ( which it does because she’s fighty as hell lmao )
this means that in modern, Izzy gets into the fights at school and Jack has to constantly bail her out lmfao
also what you definitely shouldn’t imagine is later on in their school years ( in an au?? where Maria is dead honestly idk whether she is alive or not where Izzy is concerned lmao I totally wing it ), Jack trying to attend Izzy’s parents’ evenings with her teachers as her brother because Teague isn’t interested in going ((:
when Jack is first forced to leave London and go travelling ( after all the EITC equivalent stuff goes down ), even though he has to leave his sister behind, he tries to stay in contact with her and will occasionally send her weird trinkets and keepsakes from wherever he’s living ( and this is what influences Izzy to go travelling herself B) )
bonus but as weirded out as Jack initially is by Izzy and Anamaria, deep down he’s honestly super happy that his sister has found someone who makes her as happy as Elizabeth makes him :’)