I am 18 years older than my sister. She is now 20. She has always been spoilt since she was a child and has a very selfish attitude to life. She's completely self- absorbed and thinks the world revolves around her. She has no regard for what anyone else wants or needs. She doesn't buy birthday cards or presents for anyone, not even her parents let alone myself and my dc. No Christmas presents, nothing. All along I've thought she'd grow out of it and learn some regard for others so I've always given her money in a card for birthday/Christmas. But this has been going on years and nothing is changing. Aibu to not gift her anything going forward? I feel as I'm older it's probably expected and my parents might feel I'm being petty. But she's earning her own money now and I feel she should start paying her own way. She gives nothing towards rent , food or bills either.