AIBU to feel that is not necessary lesson for a 6 year old. Staying at MIL for 2 week holiday. She encourages kids to eat healthily and behave on promise of a sweet treat. (Which I don't mind) my 6 year old gets all excited when she gets the sweet box out but then MIL insists his 8 year old sister can choose first as it's polite to let 'ladies to go first'. He then gets upset as his big sister always gets things before him. We've always taught them guests first and have occassionaly mentioned ladies first. Is it something everyone teaches their sons from a young age? Is it fair with siblings?