All siblings relationships are different... The way siblings act with each other depends on age, age gap, gender, personalities etc... It's common for a little sister to be upset if his brother who always pampers her suddenly forgets her birthday
I have 2 older brothers and I'm the youngest, and a girl, and I'm only 4 years younger than the second and I was also really pampered by them but never acted this way towards them. It's just weird.
Maybe you never needed to act this way because they always put you first...
Maybe you didn't live with your grandma when you were little and missed your bros...
Or maybe you're just not the jealous type... one of my little sisters is very jealous and she doesn't demand gifts but she acts spoiled sometimes... she gets jealous really easily (well i am a lot older and we don't live together so maybe she acts that way because she misses me)
also I do pamper all my siblings and we love each other a lot.. so yeah we are supper affectionate... some people think it's weird but i don't think it is
I have 6 brothers. I'm the youngest and the only girl in the family. Sometime they can annoy the hell out of me but I love them all deeply. Lol but I will never act like that little sister no matter how much I love them. Never (￣∇￣")