my brother never does his chores

my parents are old fashioned (its deffo a cultural thing - im arab), girls do the housework while the men relax. my sister (even when she has a job and is very busy) always does her chores and never complains but my brothers excuse for not doing his chores is that he has a job. he is a grown 26yo man that just recently got engaged to a women w a job. his views are also old fashioned (girls=housework).

my parents went away this weekend for holiday and it was just me and him at home. i refused to clean his dishes and only cleaned mine. he always yells at me whenever i dont clean up after him but my 'excuse' this time was that i literally have my a level exams in less than 20 days. dishes piled up until just before my parents came home, i didnt want to tire my jet lagged mother so i eventually gave in and did his dishes.

advice on how to possibly change my brother (if thats even possible)?

i dont see any hope for him to be honest. i also feel very bad for his fiancee i hope she can tolerate this behaviour or he can hopefully change otherwise there will be lots of issues....

Can't change someone with a regressive mentality like that. How did he even manage to get engaged?

Wait it out until you can move out.

I feel so bad for you... even I am frustrated with your brother! If I were you I would just completely neglect all of his chores

Tell the prick to stick it and to go and get his own sh*t down. People like that are genuinely outrageous, like where's your damn shame?

advice on how to possibly change my brother (if thats even possible)?

i do exactly that and my parents always yell at me for it but im gonna continue to do it because im a little petty