I'm sorry
It's not fair, just because you make slightly more money than her, they think they can just not help you out but go thru all extremes for your sister
I'm the youngest too, my brother is 4 yrs older and somehow i also feel like my mom and grandma spend more on him. He went away to college, just upstate, about an hr away and dropped out in his 2nd yr cause he was engaged to a girl. My grandma bought him a car, my mom helped a lot with the planning of the wedding, and paid for their honeymoon cruise, they never got married though. Then when he moved out my mom helped pay for him condo, oh and when he was in college it was a private school that was a lot of money, much more than mine is. And now my mom is telling me she is tired of paying for my school, when i have 2 more yrs left. Mine is so much cheaper compared to how my brother's was, i dont yet have a car...theres just a lot thats not fair
I know just how you feel..