Until you got to Chinese, I thought you were my son! 
Parents treat kids differently based on what they need. You are smart, independent and seem personable. You need less from them (in their minds). It happens. You may hit the time When you need more. I went through this with my 2 S’s. S2 got all the time attention due to his disability. Now older gets more attention bc of colleges and his general teenage PITA ness.
Try to remember no one gives us instructions when they hand us babies, so we sometimes screw up;)
My S and his dad are having ED issues too. Just try to keep making your case. He is used to having to “steer” your brother, so may have a hard time with control.
They do love you just as much. It just doesn’t always seem like it. I’m sorry it makes you feel sad. I agree, just point that it makes you feel that way instead of pushing on the you love him more thing.
Good luck.